The FAA has been considering an extension on the 2020 deadline for ADS-B Out on commercial aircraft due to a petition by Airlines for America (A4A). The exemption is being requested due to the fact that old airlines are equipped with early generation GPS receivers that may experience brief outages of the required performance for ADS-B Out, and the necessary gear with WAAS capability will not be available in time for 2020. They are proposing a 5 year grace period where the ADS-B transponders are hooked up to the old GPSs with a promise to have the approved source avionics installed by 2025.
The FAA did confirm their consideration of the petition, but has not yet reached a decision on the fate of commercial airline ADS-B Out requirements. They have stated that general aviation aircraft will not receive an extension no matter the outcome of the airliners’ request. The difference between the two industries is that there are already plenty of options available for GA owners to comply, even with more than 250,000 GA aircraft vs ~6,000 airliners requiring new equipment.
An excerpt of the FAA’s statement to AvWeb when asked about this petition is as follows: “The FAA has completed the deployment of ADS-B ground radios and has called on aviation users to equip their aircraft in advance of Jan 1, 2020 mandate. The air carrier community identified a concern with the availability and schedule for upgraded GPS receivers, which are one component of the ADS-B Out system… The FAA is reviewing A4A’s petition and will consider all public comments before determining whether to grant or deny the petition.” You can read the full details of the FAA’s response Here.