And isn't this just a delightful turn of events?
Domestic flights may be screened
U.S. seeks control over who boards Canadian flights that cross its territory
Canadian airlines that fly through U.S. airspace -- including domestic flights between such major cities as Toronto and Vancouver -- could soon be forced to vet passengers that appear on U.S. anti-terrorism 'no fly' lists.
In a move that would place additional burdens on Canadian air carriers, the U.S. Department of Homeland Security is proposing an emergency amendment to its already stringent airline regulations that would require all foreign airlines to screen their passengers before entering U.S. airspace -- even if there are no plans to land in the United States.
Hmmmm ... retaining control of one's own airspace. What a novel concept. Someone should have told this guy:
US Ambassador to Canada Paul Cellucci has warned Canadians that the United States will have no qualms about launching interceptor missiles into Canadian airspace as part of its Ballistic Missile Defense System (BMDS), claiming that Canada "[gave] up its sovereignty"  when it decided not to participate in the program. Cellucci is referring to Canada's right to decide whether the United States is allowed to launch a missile interceptor over Canadian airspace.
Like I said, delightful. We'll keep this latest indignity in mind for the next time you folks down south need to, oh, land a bunch of planes in a hurry.