I have been last August for one Month in Vietnam. Flew internally from Hanoi to Hue, from Da Nang to HCM, HCM Cambodia (Phnom Penh), from there to Siem Reep, back to Phnom Penh, HCM, Hanoi).
Never had an issue.
It was an awesome journey and my 5th time in Vietnam, 1st time with my Mavic.
One...