If you check in for a flight, but don't fly, what happens?
For instance, say I start in PHL, have a scheduled connection to CLT and then on to MSY. What happens if I go to CLT, am fully checked in for the flight to MSY, but decide not to board and stay in CLT, never taking the 2nd seg. Do they know if I boarded? And if so, I guess no credit for the miles then?
Has anyone ever done this?