I went through to pricing on AA.com and it is showing me GLN2ASR1 and/or MLN7ASD1 as the fare basis codes. I put in my family of 5 so it was bumping to a slightly higher fare basis. With the fare basis code I was able to find this in the GDS. These are legit as can be. Not sure why Matrix cannot pull them up, but these are booking in to R class. as the AS"R"1 designation kind of implies.
So if you want to build something special with ITA Matrix you can specify bc=R in the Extension Codes field. Seems to allow cheap stopover in US gateway, but not in GRU.
Last edited by stephem; Mar 4, 2022 at 2:51 pm