Originally Posted by
RxCapt
This is not correct. There was a thread a while back describing different levels of positive space travel, including Gerard Arpey's designation. These + passes begin with A, not D1.
While you are correct here as other passes such as A9, AA20, etc.
For practical purposes 97% systemwide AA nonrev travel utilizes
D1,D2,D3.. Though i didnt realize that UA boards nonrevs during
general boarding unlike AA where we are the last to board from a
previous poster?