I don't think it works like that.
Surely the CAA simply looks at Bristol's reported figures and they will include the Belfast passengers?
Alvechurch
When looking at the CAA Domestic Routes, Belfast City & Belfast International have not reported figures yet.
In addition to this looking at Bristol, neither Belfast airports are included in the list of airports served, therefore these are not currently included.
As with all CAA stats they are provisional not the final audited figures, therefore I will check again next Monday for the next update as I would expect them to report by then! I will update you accordingly!
I have just checked the report again, they are not included in the reported figures!
Take a look at the results yourself!
UK Airport Provisional Statistics: 2011 - 02 | Aviation Intelligence | Regulatory Policy