ATC
Operators Warned To Book ADS-B Upgrade Slots or Be Grounded
Slots at maintenance shops are running out fast with the deadline for being ADS-B compliant in the U.S., the end of 2019, not far away.

Aircraft owners and operators in the U.S. and Europe are facing crunch time for finding slots for their fleets to be upgraded to ADS-B, which will be required for them to continue to fly in controlled airspace beyond the end of next year in the U.S., or mid-2020 in Europe.