I've just come across a 1977 copy of Special Interest Autos (SIA #40) with a partial story about the 'Plymouth Airflow". Apparently Chrysler did indeed have thoughts about a Plymouth Airflow. It went by the engineering code 'P113'. The design was made by Norman Bel Geddes one of those people in the 30's that would design a toaster if you wanted him to. Both the interior and exterior were designed but only a clay model was finished but it appears to be full size in the photo sitting beside a 1934 Chrysler Airflow. It's a 4 door sedan with the front doors opening normal and the rears 'suicide'. The photo is courtesy of the 'Hoblitzelle Theatre Arts Library' who ever they are. I wonder whatever happened to the clay buck of the Plymouth Airflow?
Then again there may have not been, with or without Bel Geddes' influence.
http://www.2blowhards.com/archives/2007/02/yup_hatches_a_n.html
(https://www.plymouthowners.club/talk/proxy.php?request=http%3A%2F%2Fwww.2blowhards.com%2Farchives%2FBel%2520Geddes%2520Airflow%2520Design.jpg&hash=5af710d104fd719830c3e54080ca5fde2957d34d)
This is the full size Plymouth Airflow clay buck beside a 1934 Chrysler Airflow sedan.(However it could be something called 'forced perspective'. The Plymouth could be a small model.)