[ehasbrouck]

"I'd be interested to read an article about people being prevented from flying between Canada and Europe because of the US government."

Here you go:

https://papersplease.org/wp/2011/02/16/british-man-marooned-...

https://papersplease.org/wp/2011/03/18/canadian-denied-passa...

https://papersplease.org/wp/2011/05/25/us-intervenes-to-bloc...

None of these people were scheduled to fly to, from, or via the USA.

There have also been people denied passage on fligths between other countries, merely becuase they were scheduled to pass through US airspace without landing. But that's a different issue from the incidents reported in the links above:

https://papersplease.org/wp/2009/05/16/air-france-passenger-...

https://papersplease.org/wp/2010/06/07/another-paris-mexico-...

https://papersplease.org/wp/2011/07/25/mexico-barcelona-flig...