I have booked seat 10A on a 321. I meant to get the aisle seat so I called US. The aisle seat (C) is taken. The agent "thinks" there is a row 9 ABC, but she can't "find" it, saying that it is for airport release ( three months from the flight).Seat Guru seems to indicate that there is no row 10ABC, that it is the door so no row 9 ABC. Does anyone know about row 9 on a 321?

Thanks