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 airs ...

(ATC),, airspace management (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 Provider An air navigation service provider (ANSP) is a public or a private legal entity providing Air Navigation Services. It manages air traffic on behalf of a company, region or country. Depending on the specific mandate an ANSP provides one or more o ...

s (ANSPs) do not provide an ATC service that matches the capabilities of modern aircraft, so ICAO 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 populati ...

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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