What is the difference between ATM and ATC?
According to Definitions in Article 2(1) and (10) of Regulation (EC) No 549/2004 of the European Parliament and of the Council of 10 March 2004 laying down the framework for the creation of the single European sky.
‘Air traffic control (ATC) service’ means a service provided for the purpose of:
(a) preventing collisions: — between aircraft, and — in the manoeuvring area between aircraft and obstructions; and
(b) expediting and maintaining an orderly flow of air traffic;
‘Air traffic management (ATM)’ means the aggregation of the airborne and ground-based functions (air traffic services, airspace management and air traffic flow management) required to ensure the safe and efficient movement of aircraft during all phases of operations;