Traffic alert and Collision Avoidance System (TCAS) : An airborne collision avoidance system based on radar beacon signals which operates independent of ground-based equipment. TCAS-I generates traffic advisory only; TCAS-II generates traffic advisories and resolution (collision avoidance) advisories in the vertical plane.

Single till: A method used for setting a price cap for airport charges which takes account of the assets, costs and revenues of both aeronautical and commercial activities of an airport operator and relevant companies within its group.

Apron: A defined area, on a land aerodrome, intended to accommodate aircraft for purposes of loading or unloading passengers, mail or cargo, fuelling, parking or maintenance

Automatic Dependent Surveillance (ADS): A surveillance technique in which aircraft automatically provide, via a data link, data derived from on-board navigation and position fixing systems, including aircraft identification, four-dimensional position and additional data as appropriate.

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