Originally Posted by
iluv2fly
AA uses 1L more than not.
If you are seated in 9B or 9C on an AA 757, and if boarding were to take place from 2L, you would not be able to take your seat until the aircraft door has closed (AA's row 9 is where UA's row 8 lies - right in front of the doors). Thankfully, they normally board from 1L as iluv2fly points out.