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
Bobbi Trout official dedication on December 14, 1928. Trout followed this up on January 2, 1929, flying from the same airport for 12 hours and 11 minutes, shattering the previous record, held by Viola Gentry, by more than 4 hours. This record was short lived, as aviator Elinor Smith broke the record once again on January 30, 1929. Smith flew 13 and a half hours straight from Mitchel Field using an open cockpit, Bruner Winkle biplane. Determined to take back the record, Trout flew from Mines Field on February 10, 1929, returning this time after more than 17 hours. This flight also