This. For all the hemming and hawing that is done about *AA's and digital delivery, it's got to make sense compared to their current budgets. Most astute people can see the ship leaving the harbor in terms of what the future looks like, but when your revenue is measured in billions, it's easier to just let things shake out and then see who wins than it is to put it on the line and potentially get burned betting the wrong way.

edit: I don't necessarily believe in this as a sound way of doing business, but I understand why they'd think this way.