Pilot/Controller Glossary Author:Federal Aviation Administration This Glossary was compiled to promote a common understanding of the terms used in the Air Traffic Control system. It includes those terms which are intended for pilot/controller communications. The definitions are primarily defined in an operational sense applicable to both users and operators of the National Airspace System. Use of the Glossary... more » will preclude any misunderstandings concerning the system?s design, function, and purpose.« less