Previous aviation data sources suffer from several limitations. Aviation data sets are stitched together using many regional or country sources.
These sources use different technologies and systems to assemble the aircraft movement data. Primary and secondary radars, land-based ADS-B and Wide Area Multilateration (WAM) are confined to line-of-sight surveillance in densely populated areas
As a result, existing data sources do not offer a complete or single picture and often have significant gaps in fleet data, regional limitations in unique Flight Information Regions (FIRs) and incomplete data across major air traffic routes. Most airspace analysis is done with less-than-accurate assumptions and relies on scheduled information and flight plans, rather than actual routes and diversions, which often differ from the original plan when the realities of traffic congestion and weather events intercede.