VietJet, Vietnam Airlines and Jetstar for domestic Vietnam flights
Booking the ticket for VN online this week and even the standard email ticket confirmation for a domestic sgn - han looked really confusing as they seem to want to sell you check in luggage.
Only when I opened up the eticket was it clear that 20kg are included.
So what they are trying to sell is prepaid EXCESS luggage - but that sure isn't clear.
Also, the online FAQ on baggage allowance in English gives you an error page.
In Vietnamese it states that I should be getting 30kg for a domestic flight!