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
The Airplane Factory aircraft design and production processes. The company produces the two-seat The Airplane Factory Sling 2, which was first flown in 2008 and the four-seat The Airplane Factory Sling 4, introduced in 2009. In July 2013 a Sling 4 was flown by Mike Blyth and his son from South Africa to AirVenture in Oshkosh, Wisconsin, United States. The flight included a 14-hour over-water leg using the modified Sling 4's 20 hours of fuel endurance. The Airplane Factory The Airplane factory (Pty) Ltd. is a South African aircraft manufacturer based at Tedderfield Airpark, Eikenhof, Johannesburg South. The company specializes in the design