United Airlines is shaking up its MileagePlus rewards program in a move that benefits credit card holders and leaves other travelers earning fewer miles.The Chicago-based carrier announced Thursday that starting April 2, travelers with United’s co-branded credit or debit cards will earn significantly more miles when they book flights. Meanwhile, customers without a United card will have a lower accrual rate.Under the new structure, cardholders can earn up to twice as many miles per dollar spent on United flights compared to non-cardholders.For United’s most frequent flyers – like top-tier 1K m...

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