Crossword clues for the word: ICAO The word ICAO has appeared as an answer to at least 12 crossword clues on different crossword puzzles. Crossword clues for ICAO Showing 1 to 12 of 12 results Clue(s) Aviation acronym Aviation agency Flight org. (anagram of CIAO) Flyers' org. abbr. U.N. agency U.N. agency acronym UN agency concerned with civil aviation UN agency of civil aviation UN aircraft group UN aviation agency UN flying org United Nations agency acronym