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
Parking Non-Stop recordings, with many of the percussion sounds on "Species Corridor" being derived from recordings of slate captured in their local derelict quarries. This attempt to capture the sound of their local environment results in what the group have called a "rural industrial" sound. The three members had previously worked together with Welsh singer Rheinallt H Rowlands and hints of Evans' orchestral arrangements for that artist are also at times evident in Parking Non-Stop. They have been compared by various commentators to artists such as Stereolab, Einstürzende Neubauten, Kraftwerk, Broadcast, Throbbing Gristle, The KLF, Matthew Herbert and Tatu. Parking Non-Stop Parking