This photos dates to the 1920s. Its caption reads: Refueling the ‘Question Mark’ in Mid-Air. This process was repeated thirty-seven times during the remarkable endurance flight of the tri-motored Question Mark (the lower plane), which remained in the air 150 hours, breaking all records for sustained flight for aircraft, in January, 1929.

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Size: 4890px × 3447px
Photo credit: © Ivy Close Images / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: 1920s, 20th, air, airplane, airplanes, aviation, century, early, flight, history, inflight, longest, mark, mid, plane, planes, question, record, refueling, sustained