doubletree n : a crossbar on a wagon or carriage to which two whiffletrees are attached in order to harness two horses abreast
Doubletree is an international chain of full-service hotels and resorts trademarked by the Hilton Hotels Corporation. There are currently 160 properties, servicing 42,168 rooms throughout the United States, Canada, Latin America, and since April 2008, the United Kingdom. Most Doubletree hotels are independently owned and operated by franchisees, however, some are owned and/or managed by the Hilton Hotels Corporation.
Brandsthumb|right|A DoubleTree Guest Suites located in [[Uptown Houston.]] Doubletree's brands include Doubletree Hotels, Doubletree Guest Suites, Doubletree Resorts, and Doubletree Club Hotels.
- The first Doubletree Hotel opened in Scottsdale, Arizona in 1969 next to the Scottsdale Fashion Square mall. This location is now the Scottsdale Days Inn. The land is on lease from the mall and the lease will run out in 2009. The old hotel will likely be closed at that time.
- The second Doubletree hotel opened in Tucson, Arizona in 1974 and is still in operation.
- Freshly baked chocolate chip cookies were introduced in the 1980s.
- Doubletree Corporation was formed in 1994, following the merger of Guest Quarters Suites Hotels and Doubletree Hotels.
- Red Lion Hotels Inc. and Doubletree Corporation merged in 1996.
- Promus Hotel Corporation and Doubletree Corporation merged in 1997.
- Hilton Hotels Corporation acquires Promus Hotel Corporation in December 1999.
- In 2006 Doubletree Hotels began using Dinah Washington's Relax Max song in one of their television commercials.
- Doubletree opens first of brand in Europe at Cambridge Garden House Hotel, Cambridge, UK in April 2008.
The Doubletree CookieDoubletree Hotels, Suites, Resorts and Clubs present a chocolate chip cookie to each guest at check-in. Synonymous with Doubletree hospitality, the cookie has been used to differentiate the Doubletree hotel brand from its competition.
Doubletree gives out approximately 29,000 chocolate chip cookies each day, and a total of over 125,000,000. Each cookie weighs a 2½ ounces and has an average of 20 chocolate chips. The cookies are currently manufactured by The Christie Cookie company. In June 2002, Doubletree gave its 100,000,000th cookie.