Chill MC - and why aren't you (by logical extension) complaining about Link's J41's and SAX's Dash-8's? You're more likely to be held up by them than by the 1900's/Van's etc of the GA types at FAJS. US airports fit all types in - the problem is in the sky, not the piece of tarmac. And anybody can blow a tyre. Appropriate routings and procedures could solve the traffic flow problems that exist: ergo, the problem doesn't lie with the aircraft. Don't make this an us and them thing. We're all just users of the facilities.