ATM 4.25/17
Phase 1 is beginning about 2011 - 2017 with a transition through 2025. Phase 2 will likely begin in 2025 when 4-D trajectory management and co-operative ATC have been introduced. Other Regions of the world. The specific needs of all the global users are yet to be fully understood however input has been requested through the ICAO process. ................
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