優點： Yes, we were unexpected and surprised being upgrade to premier class
缺點： no complaints. very appreciated our upgrade, since we went to Prague for mother-in-law's funeral, we were absolutely exhausted.This up grade made an excellence different to us. Thanks very much.
優點： Was upgraded to Comfort Plus after they had no seat for me on the plane
缺點： We booked with Virgin however flew with Delta and we were not alerted to this. We booked with Virgin for a reason. They also did not have seats for me when I went to check in on both flights and I had to negotiate seats before boarding. Very disappointing.