Originally Posted by
MSPeconomist
If the employer also requires submission of boarding passes, those show both the PNR and ticket number, although the ticket number changes each time the ticket is reissued (upgrades supported with instruments and confirmed in advance, schedule changes, some SDCs, etc.). Could there be concern that people are cashing in tickets and purchasing cheaper tickets that they actually use for the travel? [IIRC some pro sports referees got into big trouble for doing this.]
That is exactly what was happening at my previous company and why all expense reports had to have BPs. Actually they were buying expensive last minute refundable tickets then driving. Forgotten how they were caught out before being fired.