ET- AQO / ETAQO (Ethiopian Airlines) - Aircraft info, flight history, flight schedule and flight playback. Definition of AQO in the Financial Dictionary - by Free online English dictionary and encyclopedia. What is AQO? Meaning of AQO as a finance term. What does. AQO may refer to: Llano Municipal Airport, Texas, United States (IATA code); Aluminum Company of America (Alcoa Aircraft Operations), United States (ICAO.