United and JetBlue have announced a Blue Sky partnership. This will let passengers book flights for both carriers on each other’s websites and extend frequent-flyer redemption options. United will also return to JFK International Airport for the first time in 10 years.

Jetblue and United are teaming up. The airlines announced a partnership on Thursday to sell each other’s flights and link up their loyalty points programs. It’s the latest move by JetBlue to expand its network of routes. For years, Jetblue has been searching for the one — an airline to partner with, said Richard Aboulafia of AeroDynamic Advisory.

United Airlines and JetBlue Airways announced an agreement Thursday morning to share frequent flier benefits and sell tickets on each other’s websites.