On March 3, Continental and United will have one reservations system, frequent flyer program, and website. For the most part, the new system builds on the former Continental infrastructure: It uses Continental architecture, Continental passenger records, and such.
The two carriers, which merged in 2010, have been separately reassuring us that we won't "lose" anything in the process, and—other than familiarity with the United system—we won't. All you former United types need to do is make sure that you've "linked" your frequent-flyer ID with your Continental ID. If you don't have a Continental frequent-flyer account, the United site will generate one for you.
The system will undoubtedly suffer some glitches (or at least hiccups) during the transition. I have an itinerary booked through Continental, for example, and I haven't been able to access it for the last few days; this will doubtless correct itself within a few days. Still, it wouldn't hurt to keep checking to see if your mileage, status, outstanding reservations, or whatever get through the transition accurately.
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