BTW, the 10% reduction you are quoting, is that flights or revenue?
The higher revenue flights are not down by nearly as much as the less lucrative traffic.
The chargeable units for December and January are down 8.2% and 8.3% on the previous years - better than 10%, but not much, particularly when rates are set at RPI-x. There may have been some windfall gains on exchange rates in the latter part of 2008 but NATS hedges most of its route charges income.
(see
EUROCONTROL - Service Units Forecast )
The latest predictions were due last week but still haven't been posted - don't expect too much cheer when they are issued.