EI Crimbo flights
A321 will operate LHR route from Wed 21st 725 to Sat 24th 715.
Extra A320 on 21st(Dublin based - I'm on it).
11 rtn flights or 22 rotations with A321 increase pax capacity from 3,828(A320) to 4,664(A321) an increase of 836 seats available plus 174 for extra flight = 1,010. 505 extra seats available each way to LHR, almost equal to 3 extra flights to LHR in total.