Originally Posted by
cepheid
IIUC, int'l flights longer than 12 hours qualify for paid C. Perhaps it's by dept. or by GS level, but the flight-duration rule is how it was explained to me.
The details of when gov't employees may use business class transportation are in the Federal Travel Regulation, 301-10.124. Flights over 14 hours are one instance. And the section closes by saying that gov't travelers may upgrade anytime at their expense including miles/points.