The plane took off at 12:21am and flew 2 hours when it disappeared.
It took off at 00:41. The transponder signal was lost at 01:22, when it was at 6.920833, 103.578611. So, whatever happened or started happening, took place 41 minutes in, not two hours.
27 posted on 03/10/2014 7:39:20 PM PDT by cynwoody