Originally Posted by
danger
Is LHR T5 CCR access possible in any of the following?
1) Arriving AA F T3, connecting to IB-coded and operated J T5. No
2) Arriving AA F T3, connecting to BA-coded/IB-operated J T5. No
3) Arriving AA-coded/BA-operated F T5, connecting to IB-coded and operated J T5. Yes
4) Arriving AA-coded/BA-operated F T5, connecting to BA-coded/IB-operated J T5 Yes
5) Departing AA-coded/BA-operated F T5. Yes (done that myself)
From what I've read in this thread, the answer to 1 and 3 are likely to be no; 2 and 4 possibly but likely no.
Here is my view. I think 3 & 4 are a Yes, but never tried. Bear in mind, that the "inbound First" check is manual anyway, so the lounge agent will see an inbound F boarding pass with BA on it, as it's BA operated (get the boarding pass reprinted at the BA check-in desk in the USA)
They don't scan the inbound BP. For that reason, you might even be lucky and get away with 1) and 2), but it will be more obvious to the lounge agent that it's an AA ticket inbound.