Motion-based flight simulation on a tight budget! The new CRX ProMotion AATD System. The least expensive motion simulator in production! This state-of-the-art system blends a 3-DOF motion base with our most popular simulator, the CRX. Now, affordable motion-based sims are truly within anyone's reach. With more standard features, controls and aircraft than any competitive product, the CRX ProMotion AATD system represents the best value in flight simulation today.