Today, December 7, has been pronounced the International Civil Aviation Day by ICAO (through Assembly Resolution A29-1).

"The purpose of the global celebration is to generate and reinforce worldwide awareness of the importance of international civil aviation in the social and economic development of States, and of the role of ICAO in promoting the safety, efficiency and regularity of international air transport."

http://www.icao.int/icao/en/aviation_day.htm