Originally Posted by
goodeats21
Reports above that only UA boarding passes are being accepted at Terminal C security. Good chance of being denied entry into Terminal C with an Egypt Air BP.
Option might be to clear TSA at Terminal A, then take the bus to Terminal C. I don't think they check / deny BPs for the Airside bus.
Then, take the bus to Terminal B for the flight.
I just used a non-UA boarding pass to clear Terminal C the other day. You are allowed to use a same-day boarding pass in any terminal.