A child safety restraint system (10) is disclosed for use on private and commercial aircraft the invention include a removable portable strap assembly for safely securing automotive child safety seats (14) to aircraft seat (20) and frames in compliance with present and pending federal aviation safety regulations. A system is disclosed which includes a pair of anchors (52) attached to the front beam (32) on an aircraft seat. A pair of connectable and adjustable belt assemblies (74) are attached one each, to the anchors. One belt assembly (74) is passed through the frame of a child safety seat (14) and connected to the other belt assembly. The combined length of the connected belt assemblies is then adjusted to place the system in tension and thereby secure the child safety seat to the aircraft seat. The resulting system provides significantly improved safety for children over the use of the lap belts to secure child safety seats in commercial aircraft.