vlado wrote:Apologies if this was previously discussed (I couldn't find anything previous), What is the meaning of a letter at the end of the (USAAC or USAF) aircraft serial number?
For example 44-73656 vs. 44-73656A?
Thx in advance,
VL

Vlado,
There was a point that DOD added the letter to denote what service was using the aircraft.
Bald Eagle was listed on the Bill of Sale to Maco Sales as 44-73029N. it had last served with the Ohio Air National Guard before going south. That accounts for the N at the end.
When registered in the US it got an A. Don't know why except FAA seems to not like anything with an N per the FARs. ie, only mark on an aircraft with an N shall be the N number.
A is for Army officially as far as I remember.
This was used in the 50s into the early 60s IIRC.