Upgrading your flight for the first time? Here's how to avoid being the most annoying person in first and business classes.

"I think the etiquette is that first class is about indulgence," Ott told Business Insider, adding that it's best not to ask flight attendants if each bonus offering is free because everything is complimentary, from meals to sparkling wine.

He added that there's nothing wrong with "filling your boots" to make the most of the perks.

While first-class passengers often get personalized experiences where they're greeted by name, business-class passengers shouldn't expect the same level of attention.

"Business class is about efficiency. It's a comfortable seat where you can sleep or work," Ott said.

But staff members serve dozens of people in business class, whereas first-class cabins typically seat less than 10 passengers, he added.

"There's a lot of work that goes into all those meals and drinks," Ott said. "So if you're looking for an over-the-top experience, then first class is where you can expect staff to make the flight awesome. And that's what you're paying for."

Some business and first-class cabins have added doors to each seat to give passengers more privacy. Ott said you shouldn't infringe on another traveler's space to fetch items from overhead bins.

"Don't awkwardly hover over the person because the whole idea of doors is that people can't look in on you," Ott said. "So when you wake up and someone is looking over your space, it's odd."

BI previously reported that premium cabin passengers are often entitled to overhead bin space, and according to Ott, the bins are usually not too crowded. But that doesn't mean you should bring extra bags and put them wherever you want, as Ott has seen many passengers do.

Instead, Ott suggests keeping your limited belongings in the space above your seat.