Tusayan itself
Where a South Rim Grand Canyon helicopter tour actually starts
A single street three kilometres outside the gate, a one-building terminal, and two thousand metres of altitude.
Tusayan is a single street of hotels, restaurants and an IMAX theatre about three kilometres south of the park entrance, and Grand Canyon National Park Airport sits at the end of it. Almost every South Rim Grand Canyon helicopter tour leaves from there.
It is outside the park. Which means you do not need an entrance ticket to fly, the queue at the gate does not affect you, and you can land, drive in and see the rim from the ground on the same morning.
It is small. The terminal is a single building, the aprons are a short walk, and the whole operation is visible from the car park. People who expect an airport are always surprised, usually pleasantly.
And it is high. About two thousand metres, with the rim at roughly 2,100. In practice that means the air is thin, the helicopters work harder, weights matter more, and the mornings are much colder than the Arizona in your head.
If you are staying in Grand Canyon Village inside the park, the airport is about ten minutes away by road. If you are coming up from Flagstaff or Williams, budget an hour and a half.