I came upon this via a convoluted set of links but it was pleasingly coincidental since I'd just started listening to the Audible version of the book yesterday. (The link lets you listen to a sample if you like.)
Here Ed discusses Fighter Pilot. He has a strange lack of Texas accent and rather little of Chicago, either. Midwest, maybe. Or, perhaps, just a modulation honed with hour after hour on a radio.
Very interesting and a welcome way to spend a few minutes away from the world.