The Traffic Alert and Collision Avoidance System (TCAS) is an airborne system developed by the FAA that operates independently from the ground-based Air Traffic Control (ATC) system. TCAS was designed to increase cockpit awareness of proximate aircraft and to serve as a "last line of defense" for the prevention of midair collisions. Go to their website here: Transponders/TCAS.

ADS-B Technologies, LLC is an Anchorage, Alaska based organization of international aviation experts that have joined together to help deploy ADS-B and its related Communication, Navigation, and Surveillance (CNS) technologies throughout the world. Go to their website here: Automatic Dependent Surveillance - Broadcast.

The NTSB aviation accident database contains information from 1962 and later about civil aviation accidents and selected incidents within the United States, its territories and possessions, and in international waters. Generally, a preliminary report is available online within a few days of an accident. Factual information is added when available, and when the investigation is completed, the preliminary report is replaced with a final description of the accident and its probable cause. Full narrative descriptions may not be available for dates before 1993, cases under revision, or where NTSB did not have primary investigative responsibility. Go to their website here: Research Midair Collisions.

If you are intercepted by a U.S. Military or law enforcement aircraft, immediately:

1. Follow the instructions given by the intercepting aircraft, which you can review here.
2. Notify ATC, if possible.
3. Attempt to communicate with the intercepting aircraft and/or ATC on the emergency frequency 121.5 MHz, giving the identity and position of your aircraft and the nature of the flight.
4. If equipped with a transponder, squawk 7700, unless otherwise instructed by ATC. If any instructions received by radio from any sources conflict with those given by the intercepting aircraft by visual or radio signals, request clarification while continuing to comply with the instructions given by the intercepting aircraft.

For more details on being intercepted by a U.S. Military or Law enforcement aircraft, please go to this website: What if I am intercepted?

With a membership base of more than 411,000, or two thirds of all pilots in the United States, AOPA is the largest, most influential aviation association in the world. AOPA has achieved its prominent position through effective advocacy, enlightened leadership, technical competence, and hard work. Providing member services that range from representation at the federal, state, and local levels to legal services, advice, and other assistance, AOPA has built a service organization that far exceeds any other in the aviation community.

ASF is a nonprofit pilot education and safety organization that serves all pilots—not just AOPA members—by providing free or low-cost education programs to pilots and flight instructors nationwide, analyzing safety data, and conducting safety research.

The FAA provides Depicted Special Use Airspace (SUA) and Air Traffic Control Assigned Airspace (ATCAA) data that may not be complete. Pilots should use this information for planning purposes only. For the latest SUA information, call your local Flight Service Station at 1-800-WX-BRIEF. Information concerning ATCAA airspace can be obtained from the associated Air Route Traffic Control Center. Go to their website here: Actual Military Airspace Status.