Originally Posted by
MSPeconomist
Remember that DL supposedly doesn't allow you to credit different flights of a single itinerary to different FF programs, nor can you change (or delete?) the FF number after departure of the first flight of an itinerary.
I wouldn't think of changing the number. On one hand, I might make Gold -- on the other hand, I will be Silver until March 2015. If I don't earn all the MQMs, I will both remain at Silver for 2013 and not reach it the following year.