in the United States. In the 1990s, Southwest Airlines opened a crew base in Oakland, and expanded its flights to become the airport's dominant passenger carrier. The airport has international arrival facilities, including U.S. Customs and Border Protection office. The 1990s saw a rise of low-cost carriers serving Oakland, Morris Air (later merged into Southwest Airlines), and MarkAir to name a few, provided several domestic destinations from OAK. During the 1990s, tour operator SunTrips contracted Aerocancun and Leisure Air to provide scheduled charter flights from OAK to sun destinations during the early 1990s. TAESA and Mexicana Airlines also flew between Oakland and cities in Mexico for many years. In the past Tower Air and Corsairfly flew Orly Airport to OAK to Papeete, Tahiti, Martinair flew to Schiphol Airport and CityBird flew to Brussels Airport in Brussels. 2000s United Airlines vacated its Oakland Maintenance Center in May 2003 and transferred work to its base across the bay at San Francisco International Airport (SFO). Oakland International Airport began a $300 million expansion and renovation project in 2004, including adding five gates in Terminal 2. The new concourse partially opened in fall 2006, was fully opened by spring 2007, and a new baggage claim in Terminal 2 opened in summer 2006. The former Terminal 2 baggage claim has been replaced by a renovated and expanded security screening area. As part of this program, airport roadways, curbsides and parking lots were also renovated by the end of 2008. In 2008 Oakland saw a series of cutbacks due to high fuel costs and airline bankruptcies, more than other Bay Area airports. In just a few days, Oakland's numerous non-stops to Hawaii were eliminated following the liquidation of ATA Airlines and Aloha Airlines, although Hawaiian Airlines started a daily flight to Honolulu a month later. Skybus Airlines stopped flying to Columbus, OH when it ended operations on April 5. American Airlines and Continental Airlines both dropped Oakland on September 3, United Airlines ended service to Los Angeles on November 2. 2010s Following the years of the Great Recession, during which a few airlines were either liquidated (ATA Airlines and Aloha Airlines), or consolidated business to San Francisco International Airport, OAK started a gradual recovery, which has continued through 2017. In 2009 Allegiant Air moved operations from San Francisco International Airport, before designating OAK as a focus city. After the bankruptcies of ATA and Aloha Airlines, Alaska