[Hulka]

“Apparently, the plane disappeared from radar after a couple of hours in flight, but continued to fly for some time after contact was lost.”

Haven’t read all the reports, but what do you mean “fly for some time” after contact was lost.

While enroute at altitude, radio calls and electronic communication between the airliner and ATC or the company are infrequent, so how would “they” know contact was lost?

[TomGuy]

See statement from this thread:

Conspiracy theories spiral around MH370’s disappearance

That timeline seemed to suggest that the plane stayed in the air for two hours – long enough to fly not only across the Gulf of Thailand but also far north across Vietnam. But Lindahl of Flightradar 24 said that the last radar contact had been at 1.19am, less than 40 minutes after the flight began.