dd - i was only commenting on airport charges- not a/c.. in total there is about 50 line items that have a financial number attached to them to be taken into consideration in writing an airline business plan.
The prospectus for raising money in the city for an airline will typically be 100 pages of data and numbers - and they need to stack up..... - but hey i for one would not be talking about it if it didnt have legs...!!