Airline--yes let him/her get checked in...we make money from a butt in the seat, not in the line.
Him/her--I am alway late, get over it or thanks, I really messed up and just made it thanks to you.
You/me--I plan my day so I make my flights timely, if you can't perhaps you should be inconvienced, not me???
The truth--no one should have to wait in line for 50 minutes to check-in. It is just not right. If they cannot check you in within 15 minutes of your arriving in a line then your ticket should be free!!!! This is a part of the service that is often bad, but rarely spoken about on this board.
Twice, when I have gone to Long Beach AP to get a ff ticket, I was asked to wait while "passengers" checked in for their flights even thou I had waited my turn in line already. Dummy me, I just stepped out and let everyone go thru. Fortunately, I had put enough money in the meter when I parked.