This chapter describes takeoff and landing procedures in detail and introduces parameters influencing takeoff and landing performance. Takeoff and landing that are assumed to be two significant phases of flight are two criteria for aircraft performance analysis. These two flight phases are inherently of accelerated motion, as the aircraft speed at the beginning of takeoff and at the end of landing is zero. An aircraft usually employs its maximum engine power or thrust during takeoff, whereas the engine is normally idle or at low power/thrust during landing. Takeoff is considered complete when the aircraft has reached a safe maneuvering altitude, or an en-route climb has been established. The aircraft has no contact with the runway during this section, but it is assumed to be an important part of the takeoff operation. The landing distance is influenced by brake, while the takeoff distance is influenced by engine thrust.