Originally Posted by
wanderingtheearth
Must be a fairly recent change--I was able to get access to one of the international terminals when departing from a domestic more than once within the last four years. Both via the connecting bus and on foot. First class transcons on United get (got?) access to their IFL, which is, obviously, in one of the int'l terminals.
Actually the "fairly recent change" was the other way around. It wasn't until the connection bridge from T-3 to IT-G opened around 2009 that T-3 domestic pax are allowed to use IT-G checkpoint, and for T-1C pax since the UA shuttle buses starting running between G92 and T1-C in 2012.
IT-A on the other hand is a totally different story (where both BA and CX are located). IT-A air-side is independent by itself and is not connected to any other terminals by any means. TSA at IT-A will turn you away if you don't hold a boarding pass for A1-A12. Otherwise, it kind of defeat the purpose of the boarding pass check by TSA if ANYBODY can just go in there as long as one is willing to go through security.
The only way I know of that will get the OP into IT-A is if he is connecting to AA from a Domestic/Canada flight that arrives into IT-A (JetBlue, Hawaiian, SunCountry, WestJet, AirCanada Daytime).
Source: I work at SFO.