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Section 2. Encode EXPLANATION OF CODES GEN - Indicates general aeronautical usage. NWS - Indicates National Weather Service and aeronautical weather usage. ATC - Indicates Air Traffic Control usage. ICAO - Indicates ICAO usage. International messages should use these. METAR/TAF - Indicates ICAO weather usage. Find Contraction Alphabetically A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | Y | Z |