WWII veteran help

hey guys anybody have a lead for me or can show me a good source of information?

My great uncle went missing during WWII and this is the info I have....

My grandpa's brother, was the tail gunner or waist gunner on a B-17, went MIA. From the info my family has his bomber was shot down over the baltic sea, returning from a bombing mission in Germany in 1944.

My family never heard from him again, plane was never found.

The number on his bomber was supposedly 4238162, and He was 401 bomb group, 614th bomb sqad

His Name was
A.C. Aronson
(Arlyn Curtis Aronson)

Not sure how accurate some of this information is, just wondering if anyone can help me find out anything else at all, my grandpa would really appreciate it also.