Aircraft operators provide EVAIR with all types of ATM occurrences within European airspace while ANSPs also communicate ATM occurrences. In some instances, air operators also provide reports of occurrences in airspace neighbouring European airspace. ANSPs have a dual role in the data provision mechanism. In addition to occurrence reports, ANSPs provide feedback on pilot reports, ACAS RAs collected automatically from Mode-S radar stations and Call Sign Similarity reports.
The EUROCONTROL voluntary ATM incident reporting (EVAIR) is the first voluntary ATM incident data collection organised on the Pan-European level. Bulletins are based on the reports coming from the airlines and air navigation service providers.