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
In the Wee Small Hours the lyrics. Riddle brings a rich arrangement to the harmonically simple song, which assists the mood presented in the album. "What Is This Thing Called Love" is noted by Charles Granata for its "most expressive vocal shading". Sinatra's voice approaches the bass range at times, and the interpretation is noted for the lyrical liberties Sinatra takes with Porter's lyrics. The song was recorded in 21 takes. "When Your Lover Has Gone" had a great effect on Lester Young. Young asked record store clerk Bob Sherrick to "Let me hear something by my man, Frank." "In the Wee Small Hours" had