Originally Posted by
AirWon
I'm a humble heli pilot and I use " roger that" all the time. I am very surprised to see it even being discussed in the context of this thread.
I'm a pilot too and pretty sure I've used this phrase on occasions but what I haven't seen is what he was responding to. If it was a frequency change to the Vietnamese controller then strictly speaking it is one of those items, like a runway clearance, heading, speed or altitude change where a readback is required and he didn't.
While it doesn't prove anything, other than rather casual phraseology late at night, it might have prompted the Malaysian controller to quickly ask for a readback before MH370 changed frequency to be sure of a clean handover.