Originally Posted by
MSPeconomist
If OP is in paid FC on some segment and coach on the other segment, how can this not be a broken fare? FC would need to be sold out but somehow delta.dumb permits purchase of a G A P fare? IME this hasn't happened and IIRC the fare rules have language about the instant upgrade fare requiring both coach and FC inventory in the correct buckets on each segment.
In the case of broken fares, the SDC rules apply to each flight separately and the routing cannot be changed.
This does happen on a regular basis. I booked a flight today, one segment in A and one segment in L, all covered by the same L-UP fare. Perhaps there just wasn't A inventory for the second segment, as when I tried to get FC all the way it kicked up to a P fare. The fare rules say you get an instant upgrade if available. If it's not available, the fare can still book into the coach fare class.