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United Airlines operates the "Red Carpet Club" brand of lounges.

As of early 2009, there were UA Red Carpet Clubs in these U.S. locations:

Boston (Logan/BOS),  Chicago (O'Hare/ORD),  Denver (DEN),  Honolulu (HNL),  Los Angeles (LAX),  Newark (EWR),
New York (JFK),  New York (LGA), Orange County(SNA),  Orlando (MCO), Philadelphia (PHL),  Phoenix (PHX),  Portland (PDX),
San Diego (SAN), San Francisco (SFO),   Seattle (SEA),   Washington (Dulles/IAD)
Washington (National/DCA).

As of early 2009, there were UA Red Carpet Clubs in these overseas locations:

Buenos Aires (EZE), Hong Kong (HKG),  Melbourne (MEL),  Mexico City (MEX), Osaka (KIX), Paris (CDG),  São Paulo (GRU),
and Tokyo (Narita/NRT).   Frankfurt (FRA) closed 01 October 2009  

People who belong to UA's Red Carpet Club can also use US Airways lounges at no charge, by showing one's Red Carpet Club card and a same-day ticket on US.

United Red Carpet Club members now enjoy full access to Continental President's Club locations, expanding members' options to 58 clubs in 36 airports, including 14 lounges in 10 airports not currently served by a Red Carpet Club.[1]