A †

• A1海域 (Sea Area 1)
• A2海域 (Sea Area 2)
• ACAS (Airbone Collision Aviodance System)
• AC信号 (Auxiliary Channel Signal)
• ACシンボル (Auxilialy Channel Symbol)
• ATCRBS (Air Traffic Control Radar Beacon System)
• ATCトランスポンダ (Air Traffic Controle Transponder)
• A型ワイヤレスマイク (Wireless Microphone A Type)