I have an upcoming 20k round trip flight on UA, and is in the following situation. I have some Krisflyer miles that are expiring in August. If I credit this trip to Krisflyer, I will be able to keep those miles from expiring + getting Silver status. I just got approved for the 90-day status-match challenge for the UA's Premier Silver, where I will have to fly 7,000 Premier qualifying miles (PQMs) before August 6, which the above trip certainly qualifies. With this option, I will be getting Silver w/ UA for the rest of '14. Oh, and I just got the MileagePlus CC & have met the min spending for the 30k bonus. (So much math!) Which would you choose...?