Kaehler was a Captain in the Army Air Forces.
https://www.findagrave.com/memorial/3284795
https://www.newspapers.com/clip/5370...mpa-bay-times/
(Article mentions Kaehler was "on loan" to Pan Am.)
Here is a John Yakubik, died 19 April, 1942. Buried in North Africa
https://www.abmc.gov/decedent-search/yakubik=john
De Vilbiss is also buried there:
https://www.abmc.gov/decedent-search/de-vilbiss%3Djon
In fact, ten of the men you listed are buried there. No Richardson, however.
https://www.abmc.gov/database-search..._last_name_ASC
YOUNG was Henry Newton Young, III. He was trained as a PAN AM pilot and may have been the copilot for this flight.