I'm more than a bit skeptical about that. It's true that Northwest
Airways (it didn't become Northwest Airlines until 1934) operated the
first coordinated air-rail service in the US (1928), but I don't think
they provided this service to Iowa City. No carrier was able to operate
profitably in that era hauling passengers only, they needed air mail
revenue, and they could only haul mail on their own contract air mail
routes. The route serving Iowa City and Omaha was operated by Boeing Air
Transport.

I know, that's what makes this find so strange -- and exciting. (I know; I
lead a sheltered life... :-)

See:

https://www.alpa.org/alpa/DesktopMod...DocumentID=415

to read the article.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"