Mileage program comparisons

Nancy Tan of Fresno, California, wrote, “I would be very interested in reading comparisons of airlines’ frequent-flyer-mileage programs from travelers who are members of more than one airline’s loyalty program.”

If you are or recently have been a member of more than one airline’s or airline alliance’s frequent-flyer program, which ones are they and which program do you prefer? And for what reasons. What are some specific differences between the programs? What benefits outweigh what liabilities? When you have a choice of airlines on a particular route, do you make your decision based on the mileage program and, if so, for what reason(s)?

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