Aerial refueling craft was eventually modified by Airspeed to Cobham's specification, for a non-stop flight from London to India, using in-flight refueling to extend the plane's flight duration. Meanwhile, in 1929, a group of U.S. Army Air Corps fliers, led by then Major Carl Spaatz, set an endurance record of over 150 hours with the "Question Mark" over Los Angeles. Between June 11 and July 4, 1930, the brothers John, Kenneth, Albert, and Walter Hunter set a new record of 553 hours 40 minutes over Chicago using two Stinson SM-1 Detroiters as refueler and receiver. Aerial refueling remained a very dangerous process
Islamic Republic of Iran Army Aviation as in breaking the Siege of Paveh) and Kordestan provinces. The Iran–Iraq War saw the most intensive use of helicopters in a conventional conflict ever. IRIAA flew more than 300,000 hours in direct support of the operations throughout the war, in addition to around 59,000 hours in training sorties, with an average of 100 hours recorded flight per day overall during the war. During the initial months of the war, the Army Aviation, usually operating on its own and using intelligence from local people, managed to stop Iraqi tanks from further advancing into the western territories of Iran. This was