Originally Posted by
timf
Since AA and UA are offering it on existing itineraries this time around, one would have to assume DL will offer it on existing itineraries as well if they match the offer. The spring offer started off as new tickets only so that's what other airlines matched.
I don't know - my personal opinion is if they match it will probably be on some sort of combination of new iten and/or fare class. Remember they restricted the MQM bonus to mid+ fare classes last time. Fare class seems to be central to how Mr. Robertson thinks.