October was 4%- I've calculated November and December combined need 1.56% increase for the 23 million mark to be achieved.
The blurb that's been released gives Man Utd being in the champions league this year is being seen as one of the contributors:
"Football related flights also contributed to the increase in charter flights, including trips to Bournemouth and fans flying in from Dublin. "
Looking at the fixtures, there are 4 champs league games to count for Utd and City.