Wouldn't this just be a direct reflection of each airline's fleet composition? Basically indicates that if you fly 757-200s to Europe, you will experience winter diversions -- not much surprise about that, right?
Well, there's flying a few of them to Europe (as AA does) and putting them on every route possible (major in addition to minor markets) and at unsustainable distances...like UA does.
More broadly though, there seem to be at least 3-4 UA int'l cancellations daily now, touching on all aircrafts (47s/67s/77s/87s too). We just don't seem to hear that much about them on OALs (I'm an avid reader of the AA forum and there's really no equivalent to this thread). So I'm curious to see if the data backs that up.
Remember...the operations were supposed to be "fixed"...two years ago now.