Like most of the major U.S. airlines in operation, United Airlines is a founding member of the Star Alliance, which is the largest airline alliance in the world. You'll even be able to use your bookings to work toward Star Alliance elite status. Aegean Airlines. Air Canada.
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Members of the Star Alliance include: Aegean Airlines, Air Canada, Air China, Air India, Air New Zealand, All Nippon Airways, Asiana Airlines, Austrian Airlines, Avianca, Brussels Airlines, Copa Airlines, Croatia Airlines, Egyptair, Ethiopian Airlines, Eva Air, Lot Polish Airlines, Lufthansa, Scandinavian Airlines, ...
The United MileagePlus program is also part of the Star Alliance along with more than two dozen airlines around the world, which opens the door to flight awards to almost any destination. In other words, you can use United miles to fly with United and partners such as Air Canada, Lufthansa, Turkish Airlines and more.
You can earn and use MileagePlus miles on more than 35 airlines worldwide. Select a Star Alliance™ or MileagePlus partner airline below for more information about earning miles on flights operated by that airline.
And because Lufthansa is also part of the Star Alliance (which includes major airlines like United Airlines), you can earn and redeem miles through other Star Alliance members for Lufthansa flights or on those partner airlines too.
You can redeem your miles for an award ticket of any member airline — subject to availability — irrespective of the frequent flyer programme with which you earned them.
Emirates has collaborated with other airlines, but is not a member of any of the three global airline alliances – Oneworld, SkyTeam, or Star Alliance. In 2000, the airline briefly considered joining Star Alliance, but opted to remain independent.
In the competition of Delta versus United, there isn't a clear winner. Delta charges less baggage fees and makes basic economy more tolerable for a frugal traveler. United, on other hand, has a stronger loyalty program, cheaper award prices and a stronger presence when it comes to global connections.