Ah, the splitting of hairs continues.
Just looking at US carriers for a moment....
Code:
Flights DL UA AA US WN F9 AS VX B6 NK
BOS 356 66 44 32 64 34 1 3 6 101 6
356 19% 12% 9% 18% 9% 0% 1% 2% 28% 2%
WT is right that DL holds a 2 flight lead over US for the most departures of a legacy carrier out of BOS.... That might as well be a rounding error...
But B6 is still very much the Mayor of BOS, with a 28% of scheduled departures.
Something else to consider is that DL's had to contract out 26 of their departures, US has contracted out 30, and UA has contracted out 10.
When you consider that all of the "network carriers" plus WN are operating between 32 and 40 trips a day on their own metal, it's much more of a contest than some might want to admit.
Filter out B6's E190 flying, and you've got them "only" running 46 A320s a day.
Lots of hairs to split at BOS.... and the only thing that WT's disclaimed statistic proves is that DL are trying really, really hard to be the biggest carrier by whatever statistic they can find, aside from the one that matters --- market share.