During the past two years the FAA, the SESAR JU and government agencies and industries from around the world have worked together to develop aviation system block upgrades for ICAO. The block upgrades have been developed to facilitate broad, globally harmonised ATM planning. The block upgrades are organised by modules in a matrix of times (the blocks) and capabilities (the upgrades). Block Zero comprises advances that have attained initial operating capability (IOC) already or will reach IOC this year. Block One will reach IOCs no later than 2018, Block Two no later than 2023 and Block Three no later than 2028.
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