Apologies if there is a more recent thread on this topic, but I have checked in and have an "Online seat confirmation" but not a boarding pass. I am departing from Philadelphia on QR, but arriving into PHL on an American flight on a different ticket. Does anyone know whether I can receive a boarding pass at the gate, or do I have to exit security and go to the check-in counter? Thanks in advance.

Answering my own question: I was able to get boarding passes in the BA lounge, which QR was staffing upon my arrival. ^