Screen Shot 2019-11-27 at 10.59.28 Published on November 27, 2019 in 31 December 1938Full resolution (1204 × 919) ← Previous Next → Cutaway illustration of a Boeing Model 307 Stratoliner. (NASM SI-89-4024)
I have the post-war flight cycles for these aircraft. I can post them if anyone is interested.