I agree. How about Vietnamese A.T.C asking where the flight was if it was supposed to be entering their airspace?
Right! Wouldn't you expect that by 2:00 a.m. or so, the Vietnamese tower would be looking for it? Then, I guess the Vietnamese tower would have been passed it off to Beijing (maybe even another corridor was involved).
I just assumed that a plane was always in contact with, and being tracked by, a controller somewhere. And, if it didn't show up on their watch, someone would start looking for it.
Best I can tell, no one missed M370 till it didn't show up in Beijing! Then, and only then, was it reported missing!