What's the relevant fact not being discussed here?

The BBC report that:

"Airport operator BAA saw passenger numbers at its London airports fall 10% in the first three months of 2009, as it was hit by the recession."

But nowhere in the report, that includes analysis from Robert Peston, is there any mention of the BAA's desperate need for a third runway at Heathrow, a runway whose building is strongly supported by Gordon Brown... Why?