Southwest Airlines Co. announced that Flight Instructors from Southwest, represented by the Transport Workers Union (TWU) 557, and Flight Instructors from AirTran Airways, Inc. voted to ratify their Seniority Integration Agreement. This tentative agreement, reached late last year, integrates the two groups' seniority lists. The Flight Instructors from AirTran, are now integrated into the master TWU 557 seniority list. The AirTran Instructors will continue to work for AirTran until January 2015, but may be moved over to Southwest based on operational needs. TWU 557 represents approximately 70 Southwest Airlines Flight Instructors. AirTran has 17 Instructors.