Inscription on verso: "Boeing Model 40B-4 / Boeing #NC-270 / 'United Air Lines' / Union Air Terminal, United Airport, Burbank (Los Angeles], California -- November 4, 1936, Wednesday."
[Boeing Model 40B-4 aircraft], [2008-03-31_image_671]. Museum of Flight Digital Collections, accessed 18/02/2026, https://digitalcollections.museumofflight.org/nodes/view/10849
![[Boeing Model 40B-4 aircraft]](/img/placeholder.gif?1768172589 "[Boeing Model 40B-4 aircraft]")