Four-dimensional trajectory uplinking system for aircraft

A method, an apparatus, and a system for transmitting four-dimensional trajectories to an aircraft. Four-dimensional trajectory information for a four-dimensional trajectory for a flight of an aircraft is received. The four-dimensional trajectory information includes trajectory change points describing the four-dimensional trajectory. A subset of the trajectory change points that describe a shape of the four-dimensional trajectory is selected. A message containing the subset of the trajectory change points is created in a format used by an aircraft computer system in the aircraft. The message is transmitted to the aircraft computer system.