Wasn't quite sure where to post this, but was surprised to see a United mainline 757 at an EWR Terminal A gate this morning. Was about 8AM, and I think it was at Gate 23.
I went by Gate 23 once inside the terminal, but there was no flight showing on the board at the gate.
A check of the tail number on Flight Aware shows it left EWR from Gate 81 at 10:28 AM to fly to SFO as flight UA1991
The previous entry shows arriving at Gate 126 last night at 8:42 PM
Have to wonder why it ended up at the A terminal for a bit....