Leave off the Yanks, they might be "non-standard" but they're not unsafe.
What's unsafe is how controllers and pilots across many major TMAs and international airports insist on speaking in their native tongue which degrades situational awareness and adds to workload. It's killed before and I'm positive it will do so again. This isn't a business for second guessing.
And I'm not one of these "I speak English so everybody bloody should" types. There's a time and a place.
Last edited by Callsign Kilo; 15th Jul 2013 at 21:49.