Originally Posted by
NickB
Other than that, you should receive F class credit on 2 class planes and C class credit on 3 class planes. It is therefore prudent with KUP-type fares not to schedule your flights too optimistically with overly tight connections.
If travelling on a trans-continental domestic 3 class service , the UP fare is likely to invalid to use anyway since they ,ime, have those as excluded flights in the fare rules
Dave