In telecommunication, the Aeronautical Emergency Communications System Plan (AECS) provides for the operation of aeronautical communications stations, on a voluntary, organized basis, to provide the President and the Federal Government, as well as heads of state and local governments, or their designated representatives, and the aeronautical industry with an expeditious means of communications during an emergency. Source: from Federal Standard 1037C and from the Code of Federal Regulations, Telecommunications Parts 0-199.