Notes[edit] Footnotes ^ There is an inconsistency between the description of this event by historian Albert Simpson in the Official History of the Army Air Force published in 1951[25] and that described in Hapgood & Richardson (based on a taped interview with Eaker by co-author D. W. Richardson).[24] The Official History says the flight took place in a Piper Cub at a height of "less than 200 feet" while the later publication states the flight took place in an L-5 Sentinel at an altitude of between 1,200 and 1,500 feet and that the generals’ flight was escorted by three fighter-bombers flying 1,000 feet (300 m) above them.