I don 't like the notion that airlines should be competing on weather models. As far as I am concerned, if an airline has any doubt an aircraft operate safely, I'd prefer they cancel flight (even if other carriers disagree)...while an overabundance of caution can be frustrating, I'd rather have that approach than ending up in some small out of the way airport for hours on end because of a diversion...(and with my luck I'd be on the one flight that diverted...lol)