We left Boston on 2/20, having had our tickets with seat assignment in hand, to find out upon boarding, we had no seats. 29 A and B. There was 27, 28, 31, 32......29 & 30 were the lavatories! They had changed planes, and neglected to tell us that our seats needed to be changed. Lucky for everyone we were at the back of the plane and only kept a few dozen people getting to their seats. They finally found an empty row in 22 (a full plane, and an empty tow??!!) all while having a PA voice say that if people would take their seats they could close the doors. Funny in a usual AA kind of snafu. Got to SXM; that's what counted. Left SXM Friday 3/18 and breezed thru C&I and security. I even had a seat to NY!