According to an EAA News Release, the TSA has released a list of U.S. airports that have commercial (airline) flight service and are subject to SD-8G. (The list is available on EAA’s website here) A total of 454 airports are potentially impacted by SD-8G. However, since each individual airport is responsible for its own implementation of SD-8G, it is unclear how many of these airports have, in fact, implemented SD-8G and, if they have, to what extent. As a result, if you are planning a flight that includes one of these airports as a destination, you need to thoroughly investigate the status of the implementation before taking off, including calling the airport or an FBO located at the airport to find out the airport’s security requirements.