Originally Posted by FindingFoodFluency

Unless the pandemic quashed it, I thought that there are specific flights into Tokyo Narita (and perhaps other Japanese hubs) that didn't require another security check for intl to intl, but I can't recall which ones. I think right before the pandemic, flights from the U.S. didn't have to rescreen, as long as they connected to intl routes.

Source: https://www.narita-airport.jp/en/sec...connection_ss/ (n.b.the Japanese version is still vague, but hints that some flights don't need rescreening.)

As for China, definitely have to rescreen, regardless of starting point/destination. For a hint, if anyone carries 充电宝, err portable chargers, whip them out of your bag when passing through security (they must be in your carry-ons). Plus, I had to take out coins almost every time; that was a nuisance.