Originally Posted by Schultzois

Mostly I thought of it since about a year ago I made it as far as the gate for a Brazilian domestic flight (I’m a US citizen).
No bags so no counter check-in, iPhone boarding pass to get through the access point, no ID check at security itself (which upon reflection seems a bit odd), and by the time boarding was starting I found I had left my passport in a bag stored at my hotel. Tried using other official IDs as it’ was not an international flight, but no-go and I didn’t even know it until I was at the gate unable to board. That’s the only time I’ve gotten as far as the gate and not been able to board. .