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
Never Stop Doing What You Love common" and urging them to "never stop doing what you love." McCartney received considerable criticism for his celebrity endorsement of Fidelity Investments, which some considered to be a vulgar attempt to increase his already astounding wealth. The cover features Paul playing his famous Höfner "Beatle" bass. The label side of the CD is printed to look like a vinyl record. The tracks for the compilation were chosen by McCartney and an executive from Fidelity, which had been given rights to McCartney's legacy catalog. All songs written by Paul McCartney, and performed by Paul McCartney, except where noted. Never Stop Doing