Upvote:2
Warning: Anecdotal answer!
I've now been travelling for over 10 months on this trip and have done three flights.
Other travellers I've met have had similar stories. Some were as surprised as me that they need the proof for every flight these days.
Unlike other trips where I only arranged proof of onward travel for countries I'd heard definitely asked for proof always or often, this time I've needed it for every flight no matter the airline or the country.
My conclusion is that this is a widespread "crackdown" in the "post pandemic" period around the world against people flying without proof of onward travel. It may or may not return to "normal" at some point in the coming year.
Upvote:9
Timatic, the database used by airlines to check documentation requirements, currently states for entry into Japan (here, for a UK national, without indication of residence) but this is probably more general):
Warning:
Visitors not holding return/onward tickets could be refused entry.
So VietJet Air are just doing their job.
I canβt tell you if that policy has changed recently or not (possibly in relation with COVID policies), or if its actual application has changed, or if VietJet Air are just more risk-averse than other airlines, or maybe they have faced refusals for this reason in the past (for Japan or for any other country) and now want to avoid any issues, but IMHO any airline which wouldnβt check this would be taking a risk.