SkyWest, Inc. (SkyWest) through subsidiaries, SkyWest Airlines, Inc. (SkyWest Airlines) and ExpressJet Airlines, Inc. (ExpressJet) operates the regional airline in the United States. In addition, the Company provides ground handling services for other airlines throughout its system. The Company operates in two segments: SkyWest Airlines and ExpressJet. On December 31, 2011, its subsidiary, ExpressJet Airlines, Inc. (ExpressJet Delaware) was merged into its subsidiary, Atlantic Southeast Airlines, Inc. (Atlantic Southeast), with the surviving company named ExpressJet Airlines, Inc. (the ExpressJet Combination). ExpressJet includes the operations of Atlantic Southeast Airlines, Inc. (Atlantic Southeast) and ExpressJet Airlines, Inc. (ExpressJet Delaware), which is prior to the ExpressJet Combination. SkyWest Airlines and ExpressJet provide regional flying to its partners under long-term, fixed-fee code-share agreements.