I flew with liquor on a domestic Japanese flight. They didn’t even have a scanner. I showed them that I have it in my backpack and they said it’s no problem at all.
Yeah, the domestic Japanese flight I took [in 2017] was entirely devoid of security, at least overtly. We just bought a ticket and walked to the plane, like in the good old days. Half of the people on board seemed to be carrying cats or dogs in baskets too. And the ticket was absurdly cheap. Pretty strange / cool!