Don't be excited reading this message!
I saw the UFO before.
There are spy planes flying around south china sea where most of the south asia pacific routes laid; particularly the one going to Bankok. ATC Radar can pick up their primary return on the screen and warn the airliners. Sometimes it takes over an hour for it to clear the airspace. You can guess where does it come from, nuisance isn't it?
[ 12 December 2001: Message edited by: CharlieBrown ]