A United Airlines flight was delayed after an argument between two passengers broke out on Sunday because of a $22 gadget that inhibits airline seats from reclining.

The United Airlines flight from New Jersey was diverted to Chicago after passengers began arguing over personal space due to one preventing the seat in front of him from reclining. Reportedly, the passenger was using a 'Knee Defender,' forcing the other to make her point by throwing a cup of water in his face.

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Both passengers were aboard Flight 1462's Economy Plus, which has four more inches of legroom than other economy sections, when a man allegedly used his $21.95-worth Knee Defender to prevent the seat in front of him from reclining.

After not being able to push back her seat, the women seated in front of the Knee Defender user requested the assistance of a flight attendant in asking the man to unlock the gadget so she could get comfortable during the flight.

However, the man aboard the flight to Denver refused to do so which triggered the female passenger's rage. She then drenched him with a cup of water.

Following the incident, United decided to divert the flight to Chicago where they were met by law enforcement authorities.

The two passengers were then removed from the flight which took off to its original destination.

The Transportation Security Administration dubbed the incident as a "customer service issue and not a threat to aviation security."

Though no arrests have been made, the FAA could enforce a civil fine of $25,000 for unruly passengers.

Meanwhile, Knee Defender inventor Ira Goldman explained that his product, though meant to increase legroom, has its proper uses.

"[T]he Knee Defender says right on it: 'Be courteous. Do not hog space. Listen to the flight crew.' Apparently that is not what happened here," he stated, adding that this was the first incident involving his invention.

TagsKnee Defender, Ira Goldman, United Airlines, knee defender spat, flight fight