Twelve countries have added new rules that mandate ADS-B for aircraft operating within specific regions, classes of airspace or airways. In some countries, these rules go as far as to require the aircraft operator to obtain approval from their State Registry to access the ADS-B airspace.
Other regulations create a specific benefit to operators that have equipped voluntarily. The regions where ADS-B are mandated will continue to expand, and operators should monitor for updates from their local regulatory authority.