Siregar DD and JR Norsworthy (2001). “Pre and Post Deregulation Financial Performance and Efficiency in U.S. Airlines.? in IEEE International Engineering Management Conference, Institute of Electrical and Electronics Engineers Inc.: 421-429.

Siregar DD and JR Norsworthy (2001). “Pre and Post Deregulation Financial Performance and Efficiency in U.S. Airlines.? in IEEE International Engineering Management Conference, Institute of Electrical and Electronics Engineers Inc.: 421-429.

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