Originally Posted by
sbm12
That would be quite surprising as lately rebookings into Y which are then upgraded have a habit of posting as the original fare class, not Y/B. If the ticket is not upgraded then the bonus miles are more common.
This is exactly what happened to me about 2 weeks ago. 2 legs rebooked due to irops, both into Y. Instant upgrade on one, which then posted as my original fare class (with the Z in front of it) with no bonus. No upgrade on the second leg, which posted as Y and thus 150%.