Posted on November 29, 2021 by nerfd 4Y1A International Civil Aviation ICAO. From DXNews.com 4U1A Team will be active as 4Y1A from Vienna, Austria, for International Civil Aviation Day, 7 – 11 December 2021. Share this:Click to share on Twitter (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)Click to email a link to a friend (Opens in new window) Uncategorized