The airlines will allow passengers to use and collect points interchangeably and offer flights on one another’s websites and apps.

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.

Two major U.S. airlines are joining forces in a blockbuster partnership. United Airlines will team up with JetBlue in a new alliance they are calling "Blue Sky," the carriers announced Thursday.