Originally Posted by
BigFlyer
I understand that if I made it to a US POE with an expired passport I would be fine and would be admitted. The problem would be that the airline would likely not allow me to board with an expired passport.
That's correct. You don't actually need a US Passport to re-enter the US. You'll be delayed, but once they verify your identity through database search, you're good to go. The problem is getting on the plane from wherever back to the US.