Are you wondering about ADS-B?
Directly from the Aircraft Electronics Association (AEA) today: Regulatory Update: April 3, 2019 FAA makes clear statement on non-compliant aircraft SUMMARY: On April 1, 2019, the Federal Aviation Administration published its policy for authorizations to operators of aircraft that are not equipped with Automatic Dependent Surveillance-Broadcast (ADS-B) Out equipment. Click here for a copy of the policy statement. In the FAA's statement, the agency makes it clear that any oper