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.The alliance will include a full-blown loyalty partnership that will allow United MileagePlus and JetBlue TrueBlue members the ability to earn and redeem miles on either carrier.

With this alliance, you'll be able to use your points across both airlines and book flights on either's website or app.

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