(September 2014). A general sales agent (GSA) is a sales representative for an airline in a specific country or region. Typically, the GSA is responsible for selling all products of the airline in its region which includes flight tickets and cargo space. A GSA will typically sell the product of more than one airline.
Definition of standing wave. : a single-frequency mode of vibration of a body or physical system in which the amplitude varies from place to place, is constantly zero at fixed points, and has maxima at other points.
Waves are a means of transferring energy, without actually transporting matter. Waves can be either transverse or longitudinal. Transverse waves can be set up on a string or on the surface of water. For this type of wave, the disturbance is at a right angle to the movement of the wave. Longitudinal waves can be set up on a spring, in the air when a sound wave passes, or in heavy traffic.