The Exhibit
Boeing 40B1928 Boeing 40B
![](
https://www.msichicago.org/fileadmin/assets/_processed_/0/5/csm_United_NC288-1_340c291e29.jpg 480w,
https://www.msichicago.org/fileadmin/assets/_processed_/0/5/csm_United_NC288-1_9a11ff1157.jpg 600w,
https://www.msichicago.org/fileadmin/assets/_processed_/0/5/csm_United_NC288-1_6a2bb5cbac.jpg 768w,
https://www.msichicago.org/fileadmin/assets/_processed_/0/5/csm_United_NC288-1_a8b4b9a82b.jpg 1060w)
The establishment of commercial airmail service was a boon to the aviation industry and the 1928 Boeing 40B, one of two surviving planes of its kind, served as a mail transport plane. It tried to fly as level as possible, which is reflected in its level positioning within the gallery.