Broadcast A radio transmission that originates from an aircraft and that is not directed to any particular receiving station. Related Articles: Abbreviations and Acronyms in AviationGlossary: Automatic Dependent Surveillance – Broadcast (ADS-B)Glossary: Automatic Terminal Information Service (ATIS)Glossary: Local Area Augmentation System (LAAS)Glossary: Wide Area Augmentation System (WAAS)