(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.
Transverse Standing Waves. A standing wave is produced by the superposition of waves moving to the left and right, reflecting back and forth between two fixed points. Interference effects produce both nodes, where the two waves cancel by destructive interference, and antinodes, where the waves reinforce by constructive interference.