Aviation Acronyms, Terms and Definitions - Airline and Aircraft Codes - ATC Callsigns

The World Largest Airport Database - more than 56,500 unique Airport Codes (ICAO, IATA, FAA, CA)

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Aero Glossary - Database Status
Abbreviations: 16,999 Aircraft Codes: 2,112 Airline Codes: 8,279 Airport Codes: 56,559 ATC Callsigns: 5,175 Country Codes: 714 Definitions: 1,167 Registration Prefixes: 235