Maybe it is a new enhancement. I booked a SFO-JFK-SFO trip for travel this weekend with a trip credit and cancelled it within 24 hours last week. I was charged the credit + add on and didn't get it back. I couldn't bear to call as it was $125.00 and value my time more than waiting on hold/call back for them. I rebooked it yesterday, for $1.00 more (yes $1). Today fare dropped to $208.00 RT, a $126.00 new credit and an instant PP upgrade. Pissed at first then non caring after.