Book a flight on United Airlines through Nov. 21 and get double miles. The offer is good for flights within the United States, excluding Alaska and Hawaii, and domestic segments within international flights. Of course, you have to be a member of the airlie’s frequent flyer program, MileagePlus, but that’s free to join. The double miles deal is also valid on United Express flights , and you have to register and travel between Oct. 21 and Nov. 21.
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