The fluidity of air traffic depends mainly on the coherence of the minimum separation requirements between aircraft in the airspace and the advanced exchange of air traffic information obtained through the interoperability of ATM systems and surveillance data exchange systems between aircraft and ATM system. In the paper on the implementation of unified global solutions, ICAO indicated that the key requirement is that the functions of on-ground ATM systems concerning the source of information surveillance (aircraft position). ICAO encourages the widespread use of ADS-B technology (Automatic Dependent Surveillance – Broadcast). The paper presents the concept of using ADS-B, analyzes the problems resulting from the need to ensure interoperability, and shows the results of measurements and analyzes of the actual equipment level of aircraft operating from two airports in TMA Warsaw: Warsaw Chopin Airport (EPWA) and Warsaw Modlin (EPMO). In summary, the authors refer to the level of meeting the requirements of the ADS-B equipment in the context of formal and legal requirements and the time remaining until the published requirements are fully applicable.