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ATPL Dictionary is a must-have aviation reference with more than 30,000 users worldwide, with over 1000 definitions and 900 abbreviations in the full version. If you're an aviation enthusiast or aviation curious, there's plenty here for you too. Definitions are based on subjects in the Airline Transport Pilot License syllabus, such as:- Radio Navigation- Meteorology- Airframes- Operational Procedures- Human Performance and Limitations- Mass & Balance- Instrumentation- Principles of Flight- Aircraft Performance- Flight Planning- General Navigation- Air Law- VFR Communications- IFR Communications- iCloud sync: Sync your purchase across all your devices.