降落 means to land or touch down, usually referring to an aircraft.
起飞 (qǐfēi): This term means to take off, which is the opposite action of 降落.
飞行员 (fēixíngyuán): This term refers to a pilot who operates an aircraft during flight.
航班 (hángbān): This term translates to 'flight' and represents a scheduled journey by air.