The antitrust immunity announced on Monday means Delta and Virgin Atlantic can work together on scheduling flights, and share the profits.
The airlines plan to have a combined 32 round-trip flights per day, including 24 that leave from London's Heathrow airport.
For Delta, the deal is a way to beef up its offerings between the New York area and London. It's also likely to get more connecting travelers from Virgin Atlantic.
For Virgin Atlantic, the deal is a way to get more of Delta's customers who are headed to London.
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