Abstract: In one example, a method for combining radio surveillance data includes receiving air traffic surveillance data from one or more aircraft via one or more remotely operable data link systems. The method further includes combining the air traffic surveillance data from the one or more aircraft into a composite air traffic surveillance data set. The air traffic surveillance data is based at least in part on radio surveillance messages received by the one or more aircraft from additional aircraft.

Abstract: Methods and apparatus are provided for determination of flight identification using Mode-S transponders. A method of flight identification determination includes the steps of determining a Mode-S address within a desired range of Mode S Addresses, reverse transforming the Mode-S address to an original registration number, storing the original registration number in a memory location, and transmitting the registration number, used as an ICAO Flight ID, from the memory location upon ground interrogation.