Air Traffic Service
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In aviation
Aviation
Aviation is the design, development, production, operation, and use of aircraft, especially heavier-than-air aircraft. Aviation is derived from avis, the Latin word for bird.-History:...

, an air traffic service (ATS) is an extra-ventricular service which regulates and assists aircraft
Aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...

 in real-time to ensure their safe operations. In particular, ATS is to prevent collisions between aircraft; provide advice of the safe and efficient conduct of flights; conduct and maintain an orderly flow of air traffic; and notify concerned organizations of and assist in search and rescue
Search and rescue
Search and rescue is the search for and provision of aid to people who are in distress or imminent danger.The general field of search and rescue includes many specialty sub-fields, mostly based upon terrain considerations...

 operations.

The ATS further provides four services: air traffic control services, which is to prevent collisions in controlled airspace by instructing pilots where to fly; air traffic advisory service, used in uncontrolled airspace to prevent collisions by advising pilots of other aircraft or hazards; flight information service, which provides information useful for the safe and efficient conduct of flights, and alerting service, which provides services to all known aircraft.

An ATS route is a designated route for channeling the flow of traffic as necessary for the provision of air traffic services. This include jet routes, area navigation routes (RNAV), and arrival and departure route. Routes may be defined with a designator; a path to and from significant points; distance between significant points; reporting requirements; and the lowest safe altitude
Altitude
Altitude or height is defined based on the context in which it is used . As a general definition, altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object. The reference datum also often varies according to the context...

.

Europe

Recently European ATS service providers are facing a greater change on the European market, with the introduction of Single European Sky, that devides Europe into "functional airspace blocks" - which is replacing the old, national airspace blocks.
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