this is the first time I've ever heard of this sort of issue. Had to be frustrating for you. Curious, did u check bags? didn't the rep look @ your boarding pass & ID before handing u ur baggage claim tags? You'd think they'd have caught the problem there. it is true FAs do urge everybody to find a seat ASAP as the airlines do want to keep their on-time record. Flights to MCO have lots of kids/novice travelers and tend to take a longer time to board. several times pre-SWA switch over to AT, booking and paying for seat assignments directly thru AT, I have experienced seat poachers. they boarded when their zone was called before mine. I never interact with the individuals, just summon a FA to handle the situation. it's their job, not mine, to enforce the seating that the airline has designated. Conversely, out of two subsequent trips since the switch booking AT thru SWA, haven't had to deal with finding bodies in 'our' seats.