The NPR report I heard described the requirement as being first or business class, or private jet. Which seems pretty reasonable to me.
NPR also reported that the contract calls for two bottles of water at the podium, with bendy straws. My wife claimed that the bendy straw requirement has something entirely reasonable to do with lipstick, but she started using womanly technical jargon, so I just tuned her out and went back to scraping my beard off with a Bowie knife.
Anyway, popular speaker prefers to travel business class, and says so. Shocking!