Who in the world has never dreamed or thought about flying first class when traveling? Many would think that this is luxury and will definitely cost a fortune but behold: we can experience a luxurious flight for FREE!

According to experts, the sole key to a free upgrade is booking an oversold flight.

Based on an article in Daily Star, oversold flights happen during peak seasons like summer and spring breaks and there will be instances where a passenger's seat may be rearranged.

Before booking a flight, you might also need to check on websites to see how many seats are left in each cabin like expertflyer.com.

You might also want to avoid being reported and complained about when other passengers know that you get to board the plane via first or business class for a cheaper price so it is important to keep in mind that you need to dress to impress.

Independent Traveler also stated that it will not hurt and make us less of a person to ask. You may ask if they are upgrading passengers, and let them know that you would like to be considered.

You may also try giving up your seat when the flight is oversold. If the airline ends up needing to give your seat out for another passenger, you may ask if you can be upgraded on the next flight if applicable.

Watching for business class sales will also work, as well as two-for-one sales which are most of the time advertised online. This will help you cut the cost of upgrading, if you have a companion with you when you travel.

One of the most effective way for a free upgrade to first class or business class is to ask for it when you have been inconvenienced by the airline. This could be one of the airline's way to compensate the inconveniece they have cost you.