Originally Posted by
pinniped
I like the behavior - to a point. If someone is clearly trying to cheat, trying to just jump in with a B or C boarding card when they know they shouldn't be there, then call them out. But as someone who is often the A21 perfectly happy to board after A30 because I don't feel like fighting through a scrum to get exactly between A20 and A22, I'd rather see the line keep moving and not slow the turn while the agent is calling out for me.
There has to be some application of common sense.
Nobody cares if A21 wants to board after A30. It's official policy that two people who want to board together must board at the higher position, so whether the gate agent thinks you are traveling with A30 or not, it doesn't matter.
It is not fair for A21 to board before A20, A19, ..., A1. People who can't count or are trying to cheat need to be told to step aside and wait their turn.