During the Day 1 press conference, officials confirmed that Air Traffic Control lost contact with MH370 at 18:40UTC. Why is this imporant? This is the time of our vidoes. This is the time USA 229 was staring at the coordinates in our satellite video. This is the estimated time Kate Tee has her sighting. This is the time the plane 'turned into the South Indian Ocean.' This is the time of the anomalous ping daa in the Inmarsat pings SU Log tab, first reported by me.
18:40UTC - https://tinyurl.com/bdnc948e
It wasn't until days later that this time was changed to 18:15UTC and later 18:22UTC.
  -Ashton