"Everyone else bans Boeing aircraft until their own agencies have checked them out - in response the US bans airbus from its airspace."
The reason that would be absolute proof of protectionism is that the FAA already certify Airbus airframes themselves, and don't rely on European regulators for that. If they banned Airbus because Boeing murdered a bunch of people and now nobody trusts them, it would be so blatant we might as well send the trade war nuclear.
Biting the hand that feeds IT
