Two US companies have developed an airline tracking system that they say would prevent planes disappearing in the manner of the Malaysia Airlines MH370.

Instead of sending tracking signals to ground stations - which means planes' locations can be lost over oceans or remote areas - the new system would beam them to satellites.

"It doesn't matter if they're flying over the ocean, desert, or North Pole, we'll know wher the plane is," says Daniel Baker, CEO of FlightAware, the internet flight tracking service which is working with Aireon LLC, which has developed the satellite technology.