With internet booking of airline reservations now in the mainstream, a Malaysian discount airline is introducing cell phone text messaging as a way to book tickets. It takes about 8 messages back and forth.
Asian markets are a bit ahead of the US in doing business electronically via mobile phones, but as the technology improves and becomes more mainstream this will eventually take hold in the US as well.
As for me, I’m a little skittish because I don’t yet feel comfortable shopping in all the ways that I shop before buying using just a mobile device. It’s a bit too cumbersome still. But I do use my mobile device to check schedules, on time departures, and flight availability. Booking should be next.