When the FAA set aside ten million dollars to help general aviation pilots comply with the ADS-B Out 2020 mandate, few predicted that pilots would leave more than half that money on the table, but on September 18th it’ll be official. Starting on September 19 of last year, the FAA offered aircraft owners $500 to equip their airplanes with the ADS-B Out equipment required to permit those airplanes to fly in what is now Mode C airspace after January 1, 2020.
Source: avwebFAA ADS-B Rebate Window Closing