Alaska.
Very few people take airplanes on a daily basis. The overwhelming majority of the population ride in cars not airplanes. Air travel is limited to long distance travel.
You can travel a distance in a few hours that used to take months by foot or by boat.
It is a moutainous country, subject to heavy flooding and contain few improved roads.
Generally yes. Few large commercial airplanes travel under 10,000 feet where you need oxygen or pressurization.
On foot, on horseback, and by boat. Wagons or carriages might be used in a few places, but there were not many roads once you were outside of the cities.
Most kinds of transport are used. Cars, buses and trucks, boats (few), and airplanes. Air travel is by far the most popular and widely used.
Asside fro a few spy planes, Very few airplanes can fly in thestratosphere because the air is so thin that there is not enough lift to keep up .
By ripping up the ground so it can be used for agriculture, building roads and buildings on, or to exploit the natural resources that are underneath the surface. Garbage that is blown off from properties and roads are also harmful (and very unaesthetic) to grasslands.
They are frontage roads often termed by locals as feeders. There are also Farm to Maket Roads usually marked FM a few are excellent shortcuts and interesting byways for travelers to consider taking when travel time is not a serious issue.
I have managed to make quite a few in my time.
Airplanes are available from a few thousand dollars into many millions.