Travelling by means of air is becoming common because it is the fastest means of transportation available. Issues like the lack of space and motion sickness may be problems for atleast a small fraction of the travellers. In addition to these, the inside temperature will be cold and the air will be pretty dry. But the comfort level differs in different airlines and the travel class. Domestic flights have only two classes-the business class and the economy class. In international flights, four classes-the economy class, premier economy class, business class and first class are available. There will be check-in, border control, luggage and passenger check routinely performed before the departure of the flights and border control at the destination in the case of international flights. Online booking of air tickets is possible, that too at the cheapest rates.