Dan - Nice work. This summer, I was also flying LGA-DEN-SFO and the LGA-DEN flight was oversold. The GA was able to move me to the p.s. flight, confirmed in C (I was in upgraded F on the LGA-DEN-SFO flights) and they paid for my car service over to JFK. (She seemed like she did this frequently, because she called the car service people from the desk and was chatting away with them like old friends.) I, however, was not able to negotiate for TCs and ended up with the free ticket.