AC normally charges extra for exit row seats, but SE100k members can reserve them at booking time for free.

My peeve is passengers often come from the back (with their luggage) and walk in front of my exit row aisle seat to sit in the empty window seat, usually without asking. I always tell them to check with the FA first, because it always happens after the FA gives the pre-flight briefing to the exit row. Unfortunately, the FA typically allows the move.

As a SE100k member, I didn't pay extra for my exit row seat so I can't get too annoyed. However if I *had* paid extra for the seat, I would be seriously miffed. In this situation, the FAs really need to enforce it better, like UA does with Premium Economy.