Booked online, presented the order, credit card, passport, driver's license, and a translator device at the airport store. Very convenient. However, there was a small trick; they asked us to prepay for a tank of fuel for the return, claiming it would save time since gas stations are hard to find. Later we found out that gas stations in US cities are as common as pharmacies in China, so there's no need to worry about finding a place to refuel.