334x334px, Air traffic management (ATM) is an aviation term encompassing all systems that assist aircraft to depart from an aerodrome, transit airspace, and land at a destination aerodrome, consisting of air traffic services (ATS) including

air traffic control Air traffic control (ATC) is a service provided by ground-based air traffic controllers who direct aircraft on the ground and through a given section of controlled airspace, and can provide advisory services to aircraft in non-controlled airsp ...

(ATC),,

airspace management 334x334px, Air traffic management (ATM) is an aviation term encompassing all systems that assist aircraft to depart from an aerodrome, transit airspace, and land at a destination aerodrome, consisting of air traffic services (ATS) including air tr ...

(ASM), and air traffic flow and capacity management (ATFCM). The increasing emphasis of modern ATM is on interoperable and harmonised systems that allow an aircraft to operate with the minimum of performance change from one airspace to another. ATC systems have traditionally been developed by individual States that concentrated on their own requirements, creating different levels of service and capability around the world. Many Air Navigation Service Providers (ANSPs) do not provide an ATC service that matches the capabilities of modern aircraft, so

ICAO The International Civil Aviation Organization (ICAO, ) is a specialized agency of the United Nations that coordinates the principles and techniques of international air navigation, and fosters the planning and development of international ...

has developed the Aviation System Block Upgrade (ASBU) initiative in order to harmonise global planning of technology upgrades. In the Asia/Pacific Region, the ICAO Regional Office in

Bangkok Bangkok, officially known in Thai as Krung Thep Maha Nakhon and colloquially as Krung Thep, is the capital and most populous city of Thailand. The city occupies in the Chao Phraya River delta in central Thailand and has an estimated populatio ...

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is b ...

is developing a Seamless ATM Plan, which is intended to set expectations for ATM upgrades in the world's busiest aviation region in terms of Revenue Passenger Kilometres. The Seamless ATM Plan is expected to be approved by the Asia/Pacific Air Navigation Planning and Implementation Regional Group (APANPIRG) in mid-2013.

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