alt Hacker News> Because you can't exactly sneak on/off of an international airplane.
I'm actually pretty curious about this. You can't easily sneak on/off a commercial international airplane, but that's because they've got the gates set up in the airport to funnel you through a specific path that leads to customs. Showing up on an international charter or GA flight seems squishier. http://www.canada.eaachapter.org/FLYING%20TO%20and%20FROM%20... The process seems to be that you schedule an ETA, taxi to a CBP station and wait there until a CBP officer arrives.
On the other side of it, it looks like CANPASS would let you land in Canada even if the CBSA station is closed...
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It's still quite hard to sneakily fly into the US in a GA or charter plane and land unexpectedly at an international airport which is why they seem to not count. I say that because places like the SBCC don't include 100 mile bubbles around international airports on their maps of the issue.
https://www.southernborder.org/100_mile_border_enforcement_z...
On the other hand all aircraft are tracked (we are surely not trying to account for the possibility of a stealth aircraft transporting illicit goods across the border and secretly landing somewhere), and they can decide what they're going to demand from international flights. They might be somewhat lax on runway security, maybe? But it's a pretty constrained problem and easy to keep it localized if they want to tighten it.
If you fly up from countries south of the US you have a tight list of airports you can clear customs at. Wilmington NC is the odd one on the eastern seaboard. Its about 520 miles north of the nearest one. For flights coming up from the Caribbean headed to New England its a lucrative place to be.
https://www.ecfr.gov/current/title-19/chapter-I/part-122/sub...