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For some reason it was considered news the other day that JetBlue has dropped Amex and is partnering with Barclays for its cobranded credit card:
But there is still no news of which I am aware on (a) what will be offered by Barclays to present JetBlue Amex cardholders, and (b) what will be offered by Amex to present JetBlue Amex cardholders.
I suspect Barclays & Jet Blue are restricted from providing any public information until their partnership actually starts; otherwise Amex could sue them for interfering with their contract until the contract actually ends.