Orbitz -- the travel Web site founded by United Airlines, Delta Airlines, Continental Airlines, American Airlines and Northwest Airlines -- announced four new partners.

It is adding Taiwan's EVA Airways, Alamo Rent-A-Car, National Car Rental and Fox Rent-a-Car.

EVA has one of the industry's best-developed route systems in Asia-Pacific and serves a worldwide network that includes many destinations in Europe, Canada and the U.S.

Alamo serves more than 15 million travelers a year with car, truck and van rentals through 103 locations in the U.S. and Canada, and more than 400 international locations in Europe and Latin America.

Fox serves southern and northern California.

National is one of the world's largest vehicle rental companies with more than 3,000 locations in 65 countries worldwide and on-site locations at over 250 airports in the U.S.

EVA, Alamo, National and Fox join Orbitz as charter associates, meaning they will offer the most comprehensive collection of Internet-only rates on Orbitz.