Southwest Airlines Co. opened a new maintenance facility at William P. Hobby International Airport, highlighting the importance Houston holds for the nation's largest domestic airline and underscoring its commitment to Safety while investing in the Bayou City. The 240,000 square foot maintenance complex, now the largest in the airline's network, includes offices, training facilities, warehouse space, and a 140,000 square foot hangar. This allows for the nearly 400 Houston based Technical Operations Employees to work simultaneously on up to six 737 aircraft indoors and has space for an additional eight aircraft outside the hangar bays. It replaces Southwest's smaller Technical Operations facility at Hobby Airport, which opened in 1988. The airline is currently investing in aircraft maintenance build-outs at Baltimore/Washington International Airport and Denver International Airport, as well as an expansion of its maintenance facility at Phoenix's Sky Harbor International Airport. Including the projects in Denver and Baltimore, the airline expects to have eight maintenance hangars throughout the United States.