America has showcased an experimental Air Traffic Control system that would let pilots see other nearby planes and help prevent gridlock in the skies.
The Federal Aviation Administration hopes the satellite-based navigation system will replace the current land-based system in the coming decades.
On a flight out of a Philadelphia airstrip, the FAA demonstrated parts of the system to reporters.
A small, brightly coloured screen provided a detailed picture of all the planes nearby, which showed up as green triangles.
The system uses GPS signals to give pilots information.