As of right now, there are 224 UA flights cancellations today and 89 non-UA flights in the US cancelled so far, BUT 71 of those are Skywest and Mesa, whose cancellations today appear to be entirely for UA Express flying (I might have missed one or two, but did a fair amount of reviewing flight number ranges). Move that over and it is 295 UA/UX to 18 for the rest of the US airlines.