SKY event
(Think Mirror)
YKS is the code for Yakutsk airport in Russia. Seems there have been a few incidents near there over the years (Wiki blames it on the monopoly that aeroflot had in Russia) but most recently:
https://www.
nytimes.com/2018/03/16/world/europe/russia-plane-gold.html
http://siberiantimes.com/other/others/news/plane-loses-its-368-million-cargo-of-gold-platinum-and-diamonds-on-takeoff/
Gold flying from the sky!
If that isn't a "Sky Event" i don't know what is!