The European Aviation Safety Agency (EASA) has certified ADS-B (Out) modifications for the BAe 146 and Avro RJ. The modifications were designed by BAE Systems Regional Aircraft and tested on two Avro RJs from two different airlines. Automatic Dependent Surveillance-Broadcast (ADS-B) improves situational awareness by determining an aircraft’s position via satellite navigation and periodically broadcasting it, providing Air Traffic Control and other aircraft with an accurate reading of an aircraft’s position. EASA requires ADS-B compliance by 7 June 2020 for all aircraft weighing above 5,700kg or having a maximum cruise speed greater than 250 knots, while the US FAA requires compliance by 1 January 2020. CityJet is the first airline to order the modifications, for its thirteen Avro RJ85s. The modifications will be carried out during regular maintenance.