Recent changes to Delta's upgrade policy for high-level frequent flyers have left some business travelers angry enough to switch carriers after the airline said it will no longer offer free upgrades on routes from New York to Los Angeles and San Francisco. Top-tier frequent fliers used to get a free upgrade if there was an empty seat in business class, but Delta wants those passengers to pay for the premium seat, which can cost over $5,000 when purchased a week in advance. "It blows my mind that they'd rather keep those seats empty than keep my loyalty," said Delta frequent flyer Adam Kubryk.

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