Originally Posted by
alphaeagle
I was told by multiple people including supervisors changes are not allowed on partner reservations after travel has started. Might not apply if it's only AS flights left on the reservation. I lost the rest of a trip while I was on a stopover and wasn't allowed to make any changes.
But only on one-way. For a round trip, you can still change it in the middle of a trip. I used this to slide around a trip to get CX business on the way home.