Thursday my friend took a flight SAN-DAL-FLL. He was flying SAN-FLL. Three pax stayed on in DAL. After the count, he moved to the exit seat with no seat in front of it. The first pax on after the preboarders boarded asked him if he was going to sit in that seat. He tells him yes. The other pax then complains to the FA that he paid extra for A1 just so he could get that seat. FA says "He had to put up with us for the last three hours so we felt like rewarding him, sorry".