Originally Posted by
NoLaGent
<British Airways has entered the chat>
I’ve had 3, 2 being J to F. They’re Op-Ups due to overbooking, but they do happen, and they go to OWE’s first.
Worked for me 100% of the time!
(I've been on exactly one paid international itinerary on AA and went from Premium Econ to Biz)