Originally Posted by
DLATL777
As we were waiting to deplane, she asked me if I saw the gentlemen and I repeated much what I stated here. She, with a smile on her face, said that when they questioned him, he said "the seat was open, so I sat in it".
When we deplaned in EZE there was a police officer waiting and according to what I overheard, they planned to bill him for the difference in fare.

Absolutely there should be recourse. 100% absolutely. The last thing that should become "finders keepers" are airline seats. Every single member here would flip if it happened on a domestic flight they were on and, heaven forbid, were victims of YBYL.