The frequent-flyerprogram agreement between the two includes select routes from Boston Logan International Airport and New York's John F. Kennedy International Airport.
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The carriers also said customers using their reciprocal frequent-flyerprograms would no longer earn miles or points when traveling on eligible routes, effective April 1.
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Airlines typically offer to cede airport slots or open up their frequent-flyerprograms to rivals to ease regulatory concerns that their mergers may harm competition.