I seriously doubt he wants to consult for them. This is good PR for him. He's written off American Airlines as a client potential client and a past customer.
He comes across as arrogant and full of himself. The redesign is nice, but not ground-breaking brilliant, and I can already hear him shrug and say, "well, that's stupid" when he's told that a certain change has to be made for a certain reason.
One of the hardest things to do when hiring a consultant is to figure out what they're like to work with ... will they have a good attitude, work well with people, understand and listen to requirements etc. Surprisingly to some, many companies value this kind of thing very highly.
I don't think he intended to land them as clients. This is more to showcase his skills and gain publicity. A page from 37 signals playbook. I think he has few good points about the user experience. However, the hyperbole turned me off.
I'd be surprised if this works. Typically being nice to potential customers should be a more promising approach.