Flightstats.com is showing for mainline departures today:

ORD 258
DEN 174
SFO 131
IAD 86
LAX 72

A few others:

LAS 30
SEA 21
LGA 19
MSP 17
DCA 16
JFK 13
BWI 13
EWR 12
NRT 11
LHR 8

Apologies if the counts are off a bit here or there. I did mainline only because UX flights show up as codeshares on their site, and I didn't have the time to separate out UX flights from US, AC, LH, etc. metal.