A 90,000-square-foot maintenance hangar opened Friday at Sky Harbor Airport, giving Southwest Airlines the ability to work on five aircraft simultaneously.

The project, which took several years and $100 million to complete, adds three new aircraft bays and brings more maintenance shops to support nearly 500 Southwest technical operations employees at Sky Harbor, company officials said.

The project also includes a larger facility for members of the airline’s provisioning and ground support equipment maintenance workers.  

“The safety-first work to support a continuous renewal of our fleet benefits our entire network and the community,” Andrew Watterson, Southwest Airlines COO, said.

The expanded hangar has received Leadership in Energy and Environmental Design Silver certification.

The expansion incorporated sustainable design features, including the use of recycled content in more than 30% of the building materials, the installation of high-reflectance roof and surrounding paving materials to reduce heat island effect and the selection of building products from manufacturers with verified environmental performance, according to a release.

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