Aircraft performance is one of the key aspects of the aircraft industry. Starting with the consideration of performance theory as the defining factor in aircraft design, the author of this study also covers the measurement of performance for the certification, management and operation of aircraft. The book discusses the performance measures which relate to airworthiness certificates (a legal requirement), as well as those needed when compiling the aircraft performance manual for the aircraft. In addition, operational performance is covered, including the financial considerations required by airlines to ensure maximisation of commercial return.