A passenger who was sitting next to a "man of stature" during a long flight took to social media to ask users what they would have done if they were uncomfortable.

The user wrote, "I understand how uncomfortable he must have felt, but I also have relatively broad shoulders and was confined to half of my seat with one armrest for the entirety of a 5-hour flight."

"I would never want to embarrass him or make a scene, but for future reference is there anything that could have been done?" the user asked.

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In the Reddit forum "unitedairlines," users shared their own experiences and suggestions.

One user said, "This happened to me recently. The armrest could go down, but he was otherwise spilling into my seat."

A Reddit user sparked a conversation over what one should do when uncomfortable sitting next to a large person. (iStock)

Another chimed in, "Happened to me last year and I regretted the entire five-hour flight. As soon as they plop down I would immediately get out and talk to a FA [flight attendant] about moving."

"I always get a window seat when flying economy because I can lean into it to sleep or get away from a large middle seater," said one person.

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Another user said blame shouldn’t be placed on others, but that the issue is due to the sizing of the seats.

"I always get a window seat when flying economy because I can lean into it to sleep or get away from a large middle seater," one user suggested. (iStock)

"Write an email to the airline … The problem is neither of you, it’s the airlines absolutely taking us for everything and giving us nothing," they said.

Fox News Digital reached out to United Airlines for comment on the issue.

"Firstly it has to be acknowledged, and usually the encroaching party will acknowledge and apologize," one user said. "Assuming you can’t change to a different seat, you have the option of getting off and switching to a later flight."

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The same user added, "You could get the [flight attendant] involved and get the encroacher kicked off (especially if armrest can’t go down)."

"I might be in the minority, but as long as they have good hygiene then I don’t mind," said one person. (iStock)

One user said sitting next to a person of large size is not a top concern while flying.

"I might be in the minority, but as long as [the person has] good hygiene then I don’t mind," posted one person.

A user added, "While there are definitely ‘better’ and polite ways to go about it, in nearly all scenarios you go to the FA."

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Alison Cheperdak, founder of Elevate Etiquette in Washington D.C., told Fox News Digital via email that it's important to be respectful to a neighboring passenger even if you are uncomfortable.

"When rapport is established with someone, we are more inclined to compromise and show more consideration."

"It’s important to be mindful of the other person’s space, and considerate and realistic about the situation," said Cheperdak. "If a flight is full, you may be out of luck, but it doesn’t hurt to privately ask a member of the flight crew if it is possible to change seats before you take off."

Cheperdak said that "it’s best to ask privately by, for example, getting up from your seat, so that you don’t needlessly embarrass the other person about their size."

One etiquette expert said passengers who are uncomfortable should politely address the space issue after engaging in friendly small talk. (iStock)

Rosalinda Randall, a California-based etiquette expert and trainer, told Fox News Digital via email "The obvious move is to change seats. If it’s a full flight, you’re stuck."

Randall suggested that passengers who are uncomfortable politely address the space issue after engaging in friendly small talk. 

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"Once you’ve established rapport, bring up the obvious seating dilemma. Wait to see how they respond," said Randall about the other passenger. 

Randall added, "When rapport is established with someone, we are more inclined to compromise and show more consideration."