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54-548: The Heavy Airlift Wing ( HAW ) is an international military airlift organization based at Pápa Air Base , Hungary . The organization consists of several European states and the United States. It was officially activated on 27 July 2009 as part of the Strategic Airlift Capability (SAC) program, which purchased and operates three C-17 Globemaster III military transport aircraft that fly under

108-685: A 2021 offensive following the withdrawal of US and NATO forces , foreign governments evacuated hundreds of thousands of their citizens as well as at-risk Afghans from Hamid Karzai International Airport . As part of the U.S. Armed Forces ' Operation Allies Refuge , U.S. Secretary of Defense Lloyd Austin requisitioned U.S. airliners through the Civil Reserve Air Fleet to assist the U.S. Transportation Command . The U.S. Department of Defense later claimed to have evacuated 122,000 people, including U.S. citizens and Afghan Special Immigrant Visa applicants. Other airlifts included

162-509: A combat theater from a point on the other side of the planet, if necessary. Aircraft which perform this role are considered strategic airlifters . This contrasts with tactical airlifters, such as the C-130 Hercules and Transall C-160 , which can normally only move supplies within a given theater of operations . Examples of late current large strategic airlifters include: However it is prohibitively expensive and impractical to shift

216-439: A common road. Flights were made flying at night with all lights off and under near-total radio silence to avoid Nigerian Air Force MiG aircraft . All the airplanes, crews, and logistics were paid, set up, and maintained by the joint church groups. JCA and their crews and aircraft (mostly aging multi prop airliners like DC-7 's, Lockheed Constellation and Superconstellations , DC-6 's, and DC3 's) kept flying into Biafra at

270-447: A higher heart rate, and adjusting its blood chemistry. It can take days or weeks to adapt to high altitude. However, above 8,000 metres (26,000 ft), (in the " death zone "), altitude acclimatization becomes impossible. There is a significantly lower overall mortality rate for permanent residents at higher altitudes. Additionally, there is a dose response relationship between increasing elevation and decreasing obesity prevalence in

324-463: A large portion of their income. Tactical airlift is a military term for the airborne transportation of supplies and equipment within a theatre of operations (in contrast to strategic airlift). Aircraft that perform this role are referred to as tactical airlifters . These are typically turboprop aircraft and feature short landing and take-off distances and low-pressure tires allowing operations from small or poorly prepared airstrips. While they lack

378-676: A substantial mechanised force such as main battle tanks by air. For instance the M1 Abrams could only be carried by a C-5 Galaxy (two tanks) or a C-17 Globemaster III (one tank). This difficulty has prompted investment in lighter armoured fighting vehicles (such as the Stryker ), as well as some preliminary research into alternative airlift technologies such as ground effect vehicles and airships . Civilian aircraft are also commonly used for transportation. For some civilian airlines, such as Volga-Dnepr Airlines , military contracts account for

432-414: Is always qualified by explicitly adding a modifier (e.g. "true altitude"), or implicitly through the context of the communication. Parties exchanging altitude information must be clear which definition is being used. Aviation altitude is measured using either mean sea level (MSL) or local ground level (above ground level, or AGL) as the reference datum. Pressure altitude divided by 100 feet (30 m)

486-434: Is always set to standard pressure (29.92  inHg or 1013.25  hPa ). On the flight deck, the definitive instrument for measuring altitude is the pressure altimeter , which is an aneroid barometer with a front face indicating distance (feet or metres) instead of atmospheric pressure . There are several types of altitude in aviation: These types of altitude can be explained more simply as various ways of measuring

540-410: Is due to two competing physical effects: gravity, which causes the air to be as close as possible to the ground; and the heat content of the air, which causes the molecules to bounce off each other and expand. The temperature profile of the atmosphere is a result of an interaction between radiation and convection . Sunlight in the visible spectrum hits the ground and heats it. The ground then heats

594-472: Is known as the adiabatic lapse rate , which is approximately 9.8 °C per kilometer (or 5.4 °F [3.0 °C] per 1000 feet) of altitude. The presence of water in the atmosphere complicates the process of convection. Water vapor contains latent heat of vaporization . As air rises and cools, it eventually becomes saturated and cannot hold its quantity of water vapor. The water vapor condenses (forming clouds ), and releases heat, which changes

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648-456: Is the flight level , and is used above the transition altitude (18,000 feet (5,500 m) in the US, but may be as low as 3,000 feet (910 m) in other jurisdictions). So when the altimeter reads the country-specific flight level on the standard pressure setting the aircraft is said to be at "Flight level XXX/100" (where XXX is the transition altitude). When flying at a flight level, the altimeter

702-444: Is the process of convection . Convection comes to equilibrium when a parcel of air at a given altitude has the same density as its surroundings. Air is a poor conductor of heat, so a parcel of air will rise and fall without exchanging heat. This is known as an adiabatic process , which has a characteristic pressure-temperature curve. As the pressure gets lower, the temperature decreases. The rate of decrease of temperature with elevation

756-514: The 1948 Arab–Israeli War . In 1949 Israel evacuated 49,000 Yemenite Jews to Israel via Operation On Wings of Eagles . In 1951 it carried out Operation Ezra and Nehemiah evacuating over 120,000 Jews from Iraq to Israel via British Cyprus . The Israel Defense Forces later evacuated over 8,000 Beta Israel refugees from Ethiopia living in refugee camps in Sudan through Operation Moses , Operation Joshua , and Operation Solomon during

810-528: The Bell Boeing V-22 Osprey also exist which attempt to combine VTOL flight with greater range and speed. Tactical airlift aircraft are designed to be maneuverable, allowing the low-altitude flight to avoid detection by radar and for the airdropping of supplies. Most are fitted with defensive aids systems to protect them from attack by surface-to-air missiles . The earliest Soviet tactical airlift occurred in 1929, in which forty men of

864-696: The Berlin Airlift , to supply isolated West Berlin with food and coal, the 1990 Air India airlift to rescue Indian citizens caught up in the Gulf War , and the 1967–70 Biafran airlift during the Nigerian Civil War . In November 1915 the French squadron MF 99 S , equipped with Farman MF.11 , flew wounded soldiers from Serbia through Albania to Corfu . This was the first medevac operation in air history. In April 1923 aircraft of

918-513: The Biafran secession war from Nigeria in 1967–70. This joint effort (which those involved used to call "Jesus Christ Airlines" as an inside joke from the initials JCA) is estimated to have saved more than a million lives in Biafra. Most airplanes departed from Portuguese São Tomé and Príncipe to the bush landing strip of Uli , the only operational "airport" in Biafra, which was made by enlarging

972-774: The British Royal Air Force 's Iraq Command flew 280 Sikh troops from Kingarban to Kirkuk in the first British air trooping operation. This operation was only conducted over a short-range and it was not until 1929 that the RAF conducted a long-range non-combat air evacuation of British Embassy staff from Afghanistan to India using a Vickers Victoria during the Kabul airlift . The world's first long-range combat airlift took place from July to October 1936. Nazi German Luftwaffe Ju 52 and Fascist Italian Regia Aeronautica Savoia-Marchetti SM.81 were used by

1026-670: The British Armed Forces ' Operation Pitting , the Canadian Armed Forces ' Operation AEGIS , and the Indian Armed Forces ' Operation Devi Shakti . Strategic airlift is the use of military transport aircraft to transport vehicles , materiel , weaponry , or personnel over long distances. Typically, this involves airlifting the required items between two airbases that are not in the same vicinity. This allows commanders to bring items into

1080-654: The Ethiopian famine and civil war . During the First Indochina War , the French expeditionary forces devised the hérisson (' hedgehog ') concept, establishing a fortified airhead by airlifting soldiers to positions adjacent to key Viet Minh supply lines to Laos. This would cut off Viet Minh soldiers fighting in Laos and force them to withdraw. "It was an attempt to interdict the enemy's rear area, to stop

1134-661: The Gulf War , which repatriated 176,000 Indian migrant workers stranded in Ba'athist Iraq after the invasion of Kuwait . India has conducted other airlifts of migrant workers during Middle Eastern crises. The Indian Navy evacuated numerous Indian civilians from the 2006 Lebanon War via Operation Sukoon , from the First Libyan Civil War via Operation Safe Homecoming , from the South Sudanese Civil War via Operation Sankat Mochan , and from

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1188-794: The Nazi-occupied Netherlands through Operations Manna and Chowhound to alleviate the Dutch famine of 1944-45 . The largest airlift was the Berlin airlift , lasting from June 1948 to September 1949, an international operation intended to thwart the blockading of West Berlin by the Soviet Union . The airlift was arranged by the U.S. Air Force , the British Royal Air Force, the French Air Force ,

1242-627: The Red Army were airlifted to the town of Garm , Tajikistan (then the Tajik Autonomous Soviet Socialist Republic ) to repel an attacking force of Basmachi rebels under Fuzail Maksum . Examples of late current large tactical airlifters include: Altitude Altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The exact definition and reference datum varies according to

1296-811: The Royal Canadian Air Force , the Royal Australian Air Force , the Royal New Zealand Air Force , and the South African Air Force using C-47 Skytrains , C-54 Skymasters , Handley Page Haltons , and Short Sunderlands . Many Soviet and Western leaders alike initially assumed that an airlift to resupply West Berlin would fail because of the results of the Battle of Stalingrad. However, it instead succeeded and became an embarrassment for

1350-848: The Saudi-Yemen War in Operation Raahat . The Pakistan Navy also evacuated Pakistani nationals from Yemen via an airlift during the Saudi intervention. The Indian Armed Forces also conducted an airlift to Nepal after the 2015 Nepal earthquake through Operation Maitri . During the outbreak of the COVID-19 pandemic in Wuhan , numerous air forces and civilian airlines arranged evacuation flights from Wuhan Tianhe International Airport . The highest rate of civilian airlift in history (number of civilians evacuated per day)

1404-796: The Spanish Nationalist Air Force to transport Army of Africa troops from Spanish Morocco to the Spanish mainland at the beginning of the Spanish Civil War . Airlifts became practical during World War II as aircraft became large and sophisticated enough to handle large cargo demands. The Germans used an airlift in successful relief of the Demyansk Pocket , albeit with the Luftwaffe suffering considerable losses to its fleet of transport planes. Due to

1458-487: The troposphere (up to approximately 11 kilometres (36,000 ft) of altitude) in the Earth's atmosphere undergoes notable convection; in the stratosphere , there is little vertical convection. Medicine recognizes that altitudes above 1,500 metres (4,900 ft) start to affect humans, and there is no record of humans living at extreme altitudes above 5,500–6,000 metres (18,000–19,700 ft) for more than two years. As

1512-799: The Central African Republic , 2015–. The wing has also conducted missions to provide logistical support to the investigation of the 2014 Malaysia Airlines MH17 crash in Ukraine. Significant humanitarian operations supported by the wing include earthquake relief in Haiti , 2010, flood relief in Pakistan , 2010, and hurricane relief to the island of Saint Martin , 2017. The HAW is independent of any command by NATO , European Union , Partnership for Peace , United Nations , or any other organization that HAW member states belong to or support in

1566-416: The French aircraft to use the runways, afterwards a bombardment forced the French to abandon use of the airstrip altogether and rely upon parachute drops. The besieged French forces eventually surrendered. The largest civilian airlift ever, the Biafran airlift , was carried out by Protestant and Catholic churches working together under the banner "Joint Church Aid" (JCA) to carry food to Biafra , during

1620-1049: The Heavy Airlift Wing on temporary or permanent positions. The SAC members have requested missions in order to meet their obligations to employ/deploy/redeploy forces and equipment in support of national, UN , EU , NATO obligations, exercises, training and humanitarian relief, including the International Security Assistance Force 2009–2014, and the Resolute Support Mission , 2015–2021 in Afghanistan . Operation Unified Protector in Libya , 2011. United Nations Multidimensional Integrated Stabilization Mission in Mali , 2013–. The EUFOR RCA , 2014–2015. The United Nations Multidimensional Integrated Stabilization Mission in

1674-701: The Hump by November 1945. After many USAAF airmen were shot down in Nazi-occupied Serbia during Operation Tidal Wave , the U.S. Fifteenth Air Force and the Office of Strategic Services evacuated a number of them in Operation Halyard with the assistance of Draža Mihailović 's Chetnik partisans. Additionally, at the end of World War II the USAAF and the RAF arranged humanitarian airdrops to

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1728-826: The Soviet Union, which ended the blockade. The blockade and the success of the airlift would be a major factor in the beginning of the Cold War and the formation of the North Atlantic Treaty Organization , the Western European Union , and the Federal Republic of Germany . The Israeli Air Force and El Al conducted a number of airlifts during the Jewish exodus from Arab and Muslim countries to Israel after

1782-635: The United States, beginning the 1970s energy crisis . During the 1974 Turkish invasion of Cyprus the Hellenic Air Force attempted to airlift commandos to Nicosia Airport through Operation Niki but failed after the Nord Noratlas planes were shot down by friendly fire from the Cypriot National Guard after flying over RAF Akrotiri . The largest civilian airlift in history was conducted by Air India during

1836-534: The United States. In addition, the recent hypothesis suggests that high altitude could be protective against Alzheimer's disease via action of erythropoietin, a hormone released by kidney in response to hypoxia. However, people living at higher elevations have a statistically significant higher rate of suicide. The cause for the increased suicide risk is unknown so far. For athletes, high altitude produces two contradictory effects on performance. For explosive events (sprints up to 400 metres, long jump , triple jump )

1890-414: The air at the surface. If radiation were the only way to transfer heat from the ground to space, the greenhouse effect of gases in the atmosphere would keep the ground at roughly 333 K (60 °C; 140 °F), and the temperature would decay exponentially with height. However, when air is hot, it tends to expand, which lowers its density. Thus, hot air tends to rise and transfer heat upward. This

1944-441: The altitude increases, atmospheric pressure decreases, which affects humans by reducing the partial pressure of oxygen . The lack of oxygen above 2,400 metres (8,000 ft) can cause serious illnesses such as altitude sickness , high altitude pulmonary edema , and high altitude cerebral edema . The higher the altitude, the more likely are serious effects. The human body can adapt to high altitude by breathing faster, having

1998-439: The altitude: The Earth's atmosphere is divided into several altitude regions. These regions start and finish at varying heights depending on season and distance from the poles. The altitudes stated below are averages: The Kármán line , at an altitude of 100 kilometres (62 mi) above sea level , by convention defines represents the demarcation between the atmosphere and space . The thermosphere and exosphere (along with

2052-577: The apparent vindication of the airlift tactic, Chief of the Oberkommando der Luftwaffe Hermann Göring assured Adolf Hitler that the Luftwaffe could conduct an airlift on a larger scale, which was the key factor not to let the Sixth Army withdraw from Stalingrad after its encirclement by the Red Army . However the Luftwaffe was strained at this point while facing better prepared Soviet air forces at Stalingrad, so they were unable to delivery

2106-506: The context (e.g., aviation, geometry, geographical survey, sport, or atmospheric pressure). Although the term altitude is commonly used to mean the height above sea level of a location, in geography the term elevation is often preferred for this usage. In aviation, altitude is typically measured relative to mean sea level or above ground level to ensure safe navigation and flight operations. In geometry and geographical surveys, altitude helps create accurate topographic maps and understand

2160-423: The continent or theater), whereas a tactical airlift focuses on deploying resources and material into a specific location with high precision. Depending on the situation, airlifted supplies can be delivered by a variety of means. When the destination and surrounding airspace is considered secure, the aircraft will land at an appropriate airport or airbase to have its cargo unloaded on the ground. When landing

2214-521: The cost of many crews lives. During the 1973 Yom Kippur War , the U.S. Air Force Military Airlift Command conducted Operation Nickel Grass to resupply Israel in the face of a coordinated surprise attack by Egypt and Syria . The airlift allowed Israel to begin a counteroffensive against the Arab states but caused the Organization of Petroleum Exporting Countries to place an oil embargo on

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2268-400: The craft or distributing the supplies to a certain area from a landing zone by surface transportation is not an option, the cargo aircraft can drop them in mid-flight using parachutes attached to the supply containers in question. When there is a broad area available where the intended receivers have control without fear of the enemy interfering with the collection and/or stealing the goods,

2322-558: The flow of supplies and reinforcements, to establish a redoubt in the enemy's rear and disrupt his lines". It was executed successfully at the Battle of Nà Sản , so the French hoped to repeat it on a larger scale at the Battle of Điện Biên Phủ . However, based on the lessons learned from Nà Sản, the Viet Minh improved their preparations at Điện Biên Phủ including concealed artillery and massed anti-aircraft batteries, making it dangerous for

2376-465: The higher parts of the mesosphere) are regions of the atmosphere that are conventionally defined as space. Regions on the Earth 's surface (or in its atmosphere) that are high above mean sea level are referred to as high altitude . High altitude is sometimes defined to begin at 2,400 meters (8,000 ft) above sea level. At high altitude, atmospheric pressure is lower than that at sea level. This

2430-563: The lapse rate from the dry adiabatic lapse rate to the moist adiabatic lapse rate (5.5 °C per kilometer or 3 °F [1.7 °C] per 1000 feet). As an average, the International Civil Aviation Organization (ICAO) defines an international standard atmosphere (ISA) with a temperature lapse rate of 6.49 °C per kilometer (3.56 °F per 1,000 feet). The actual lapse rate can vary by altitude and by location. Finally, only

2484-907: The letter "A". Athletes also can take advantage of altitude acclimatization to increase their performance. The same changes that help the body cope with high altitude increase performance back at sea level. These changes are the basis of altitude training which forms an integral part of the training of athletes in a number of endurance sports including track and field, distance running, triathlon, cycling and swimming. Decreased oxygen availability and decreased temperature make life at high altitude challenging. Despite these environmental conditions, many species have been successfully adapted at high altitudes . Animals have developed physiological adaptations to enhance oxygen uptake and delivery to tissues which can be used to sustain metabolism. The strategies used by animals to adapt to high altitude depend on their morphology and phylogeny . For example, small mammals face

2538-616: The national markings of Hungary. The Heavy Airlift Wing is currently commanded by a Colonel from the Swedish Air Force, and is composed of up to 155 military personnel from the 12 participating states; Bulgaria , Estonia , Finland , Hungary , Lithuania , the Netherlands , Norway , Poland , Romania , Slovenia , Sweden , and the United States . Strategic Airlift Capability members send their personnel to work for

2592-563: The necessary supplies before the airfields were overrun. In spite of the airlift's obvious shortcomings, Hitler refused permission for the Sixth Army to attempt a breakout, eventually leading its commander Friedrich Paulus to surrender. The U.S. Army Air Force 's Air Transport Command began the largest and longest-sustained airlift of the war in May 1942, delivering more than half a million net tons of materiel from India to Free China over

2646-467: The planes can maintain a normal flight altitude and simply airdrop the supplies down and let them parachute to the ground. However, when the area is too small for this method, as with an isolated base, and/or is too dangerous to land in, a Low-altitude parachute-extraction system drop is used. During disasters and other crises, airlifts are used to support or replace other transport methods to relieve beleaguered civilian populations. Examples include

2700-630: The reduction in atmospheric pressure signifies less atmospheric resistance, which generally results in improved athletic performance. For endurance events (races of 5,000 metres or more) the predominant effect is the reduction in oxygen which generally reduces the athlete's performance at high altitude. Sports organizations acknowledge the effects of altitude on performance: the International Association of Athletic Federations (IAAF), for example, marks record performances achieved at an altitude greater than 1,000 metres (3,300 ft) with

2754-598: The speed and range of strategic airlifters (which are typically jet -powered), these capabilities are invaluable within war zones. Larger military transport helicopters , such as the CH-47 Chinook and Mil Mi-26 , can also be used to airlift personnel and equipment. Helicopters have the advantage that they do not require a landing strip and that equipment can often be suspended below the aircraft allowing it to be delivered without landing but are fuel inefficient and thus typically have limited range. Hybrid aircraft such as

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2808-416: The terrain's elevation. For high-altitude trekking and sports, knowing and adapting to altitude is vital for performance and safety. Higher altitudes mean reduced oxygen levels, which can lead to altitude sickness if proper acclimatization measures are not taken. Vertical distance measurements in the "down" direction are commonly referred to as depth . The term altitude can have several meanings, and

2862-824: The various missions. It is overseen by the SAC Steering Board, which manages its activities with support of NATO Airlift Management Programme Office (NAM PO). The SAC sets requirements and the NAM PO executes those requirements by sourcing the majority of the technical, logistic, and training support to the C-17 fleet from the United States and its military and Foreign Military Sales (FMS) programs, including C-17 maintenance which are contracted with Boeing . Airlift Airlifting consists of two distinct types: strategic and tactical. Typically, strategic airlifting involves moving material long distances (such as across or off

2916-628: Was during fall of Kabul in August 2021, where 778 flights evacuated 124,334 people over 17 days - 7,300 civilians per day (compared to 2,700 per day airlift of Indians from Kuwait in 1990). The evacuation peaked on August 23, 2021, where over 21,600 civilians were evacuated in a single day. During the fall of Kabul at the end of the War in Afghanistan after the Taliban captured most of Afghanistan in

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