And that was the birth of United Airlines. United resulted from the restructuring of Boeing Air Transport (BAT) in 1934. Boeing realized it was more profitable to fly pax instead of mail so he was building a sizable business when 1934 rolled around. He was savvy but that he gave his airline first dibs on any new aircraft or ungrade, much to the consternation of his competitors, he was most likely instrumental in having to divest himself of the airline.
Incidently, United's first aircraft was a Boeing 80A, a trimotor with a triple tail and the first aircraft ever with wheel brakes. After a couple years barnstorming based out of Monterey, CA it was again sold to haul freight in AK for Bob Reeves. Reeves hauled it into the Anchorage city dump in '63 where it sat for many years until spotted by a UAL pilot. It's now in the Museum of Flight at Seattle's Boeing Field.