Originally Posted by
DataPlumber
Presumably the OP was reimbursed for the tickets at which point they are his employers property. Large companies do have people that track this stuff.
That's assuming the OP was in fact reimbursed. If the OP never took the trip(s) then there might not have been an expense report. Possibly the employer paid for a flight in the OP's name, cancelled the trip, and subsequently let the OP go and since that credit can't be used for anyone else ate the $1.5K.