Weather Delays and other Urban Legends

Man do I feel naive. Having just returned from a cross-country trip by air, I was actually surprised to read the latest "Ask the pilot" at Salon. Here's all you need to know:

Your attention please: With scattered exceptions, there is no such thing as a weather delay. They are traffic delays. Your flight was not late because of the weather. It was late because there are too many small airplanes carrying too few people, end of story.

There are too many regional airlines (ie, those little commuter jets you see everywhere) clogging up the skies. It's not the thunderstorms. I'm kind of shocked that this isn't news.