I somewhat disagree with it being straightforward. 99% of the time it can be, but there's some notable edge cases that are missing from that website. There's be

I somewhat disagree with it being straightforward. 99% of the time it can be, but there's some notable edge cases that are missing from that website. There's been a handful of cases where people have flights with connections through NY/NJ, miss their flight (or have to divert to NY/NJ for mechanical problems and transfer to a new aircraft), collect their luggage that has a firearm in a locked container, and then get arrested for possessing a firearm without the mandatory NY/NJ state permit (which IIRC are only available to residents)