It's fourteen scheduled flights per day out of DUB to North America.
AC/AA/DL/DL/UA/UA/US/US and EI x 6. I'm assuming that if they count each turnaround as two flights that gets them to 28, then adding in TS still leaves that number a little high...
AA have 2 daily flights
DL have 3 extra weekly
TS have 5 weekly
Can't remember but US may have 1 or two extra weekly as well.