As airlines add fees, more desirable seats have become more expensive and more difficult to book, resulting in some passengers offering bribes for better seats, according to FOX News.

Last year, domestic flights were 83 percent full, which was the highest percentage since 1945.

Airline employees can't take bribes from passengers or they will lose their jobs, resulting in few employees that are willing to help picky passengers that find themselves blocked out of their desired seat.

Some passengers have now resorted to offering money to other passengers in exchange for a better seat on the plane. This practice is not technically illegal or prohibited by the airlines, though some are concerned it will create a chaotic atmosphere in the cabin.

"It could start a trend that will be hard for the airline industry to turn off," Dr. Joyce Hunter, an associate professor at Saint Xavier University, told FOX News. "Once the airlines start letting this happen it could cause serious problems, because inevitably there will be disputes.

"Where is it going to stop?" Hunter continued.

Jason Goldberg, the CEO and founder of web site Fab.com offered another passenger $100 to swap seats in a flight from Stockholm to Newark so he could collaborate with a colleague on a work project during the flight. The other passenger declined the offer and Goldberg posted a rant about it to his Facebook page, which has 37,000 followers.

"The dude next to Bradford [the colleague] was just a jerk," Goldberg wrote. "Said he was too comfortable to move."

The rant had negative responses, with people finding Goldberg entitled.

None of the major airlines have a policy in place regarding passengers selling their seats to each other. United Airlines told FOX that passengers that wish to change seats should speak to a gate agent, American told them it wasn't aware of the issue and Southwest said that it wasn't a problem for their passengers because they have an open seating policy.