Travel class on an airplane is usually split into a two or four class model. Domestic flights usually have two classes: economy Class cabin and business class cabin, whereas international flights usually have four classes: an economy class cabin, a premium economy cabin, a business class or a club class cabin and finally, a first class cabin.
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.