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Air travel using a vehicle like an airplane, helicopter,

Air travel is a form of travel using a vehicle like an airplane, helicopter, hot air balloon or anything else that can sustain flight.
National or domestic

A person flying from one point to another within the same country is known as a domestic flight.
International

When a person travels from a point in one country to a point within a different country it is known as an international flight.
Air travel

Travel class on an airplane is usually split into a two, three or four class model. US Domestic flights usually have two classes: Economy Class and a Domestic First Class partitioned into cabins. International flights may have up to four classes: Economy Class, Premium Economy, Business Class or Club Class and First Class.

The differences between premium economy and economy are quite significant, but the cost is not greatly altered by purchasing a Premium Economy ticket. The price difference between an economy class ticket and a first class ticket, however, are often extreme.

Most air travel starts and ends at a commercial airport. The typical procedure is check-in, border control, airport security baggage and passenger check before entering the gate, boarding, flying and pick-up of luggage and - limited to international flights - another border control at the host country's border.