When I go on vacation, I usually travel by plane. In the past, I used to book a flight with a travel agency, but now, I tend to search online for good deals on plane tickets. Finding the best price on plane tickets is probably the most important consideration, but the departure time, the number of layovers, and the length of flight are also important factors. Making plane reservations online is pretty easy to do, but don't forget that you still have to pay certain fees and taxes that go along with the price of the ticket. Finally, keep in mind that you might have to pay a cancellation fee if you decide to change your flight plans or cancel your flight.