Charlie, Good question, last summer after lots of looking I talked to the guy in Montana that my friend used a few years back to recap his Airsteaks. I can't recall his name but he told me the FAA made a friendly visit to his shop one day and asked him to stop. To bad! He did a great job on my friend's tires. Good luck, and let me know what you find.
If your interested I have a pair of 29" Air Hawk's on cleveland's, make me an offer. D C