Originally Posted by YVR Cockroach

Not excusing the U.S. airlines but they tend to operate domestic flights going through hubs, while most non-U.S. airlines don't do that (only Russia and Canada, and maybe Australia being big enough to do that?). Of course, that doesn't excuse the change of gauge for flights that go from an international city to a U.S. hub, before going to another U.S. destination (or v-v).