Abstract: An air cushion landing system for aircraft, ground effect machines and the like utilizing boundary layer control around the outer sides of an inflated bag to improve its aerodynamic characteristics. This is achieved by air jets along the outside walls of the bag, the jets being normal or essentially tangential to the outside wall surface of the bag depending upon the aerodynamic effect desired. Preferably, the air jets are produced by simply permitting air, used to inflate the air cushion landing bag, to escape through orifices in the side walls of the bag.