WASHINGTON — JetBlue and United Airlines will soon let customers use and earn miles across both airlines, after passing a review by federal regulators this month.

JetBlue and United announced the partnership , known as "Blue Sky" after a review by the U.S. Department of Transportation cleared the collaboration. It was originally announced in May, two years after a similar partnership between JetBlue and American Airlines was blocked by a federal judge.

Customers will be able to earn JetBlue's TrueBlue points by using their account number when booking a United flight. Likewise, customers on JetBlue can earn MileagePlus miles by putting in their United account number when booking.

The airlines haven't given details about how to use miles to book each other's flights, but said that info

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