Revisiting a la carte airline pricing

I've talked about airlines' a la carte pricing, and I've joked about it. But Jason Kottke has pointed out:

The airlines that added the most fees (for food, to check bags) in the past few months saw their revenues decline the most.

Now perhaps a causation is being inferred that isn't there (see Jonathan Lewis' discussion of this), and there might be a third factor that is the cause of these correlated facts. But it's something to think about nevertheless.

Let's face it - if it hadn't been for other circumstances, my last trip to Las Vegas would have been by bus rather than by plane. And that plane flight was with an airline that DOESN'T charge bag fees.