Costco sets date for breakup with AmEx; Visa perks will be sweeter

A year after Costco and American Express announced their split, the warehouse club said Thursday that June 19 will be the last day that it will accept American Express credit cards.

Details were disclosed on Costco.com and in the warehouses, where shoppers were given slips of paper at the checkouts explaining the change.

The partnership has been in effect for 16 years and it is a sizable one for both firms.

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