Unless you are ensconced in first class, sleeping on a plane is as intimate as dozing off in a waiting room on jury duty — everyone on the aircraft knows the decibel level of your snoring and the sad state of your socks.

To gauge how passengers perceive and handle nightmare flight scenarios, British Airways surveyed 1,500 travelers from the United States, the United Kingdom, France, Germany, and Italy. The responses are eye-opening but do not necessarily represent the gold standard of politesse. For the best practices at high altitudes, we reached out to Lizzie Post, a president at the Emily Post Institute in Burlington, Vt., and cohost of the podcast "Awesome Etiquette." Here are the insights from your fellow travelers — and the final word from the manners expert.

Passengers say: When it comes to armrests, 67 percent of respondents said passengers should commandeer only one side and leave the other for their neighbor. More than 40 percent of British and American passengers occupying the middle seat said they were most likely to monopolize both armrests. Travelers from Italy, France, and Germany were more courteous: Nearly half said the valuable real estate should go to the first person who asks.

Lizzie says: "Don't try to stake a claim on the armrest. Share it." She recommends sharing the physical space (for instance, you take the front section and your seatmate claims the back portion) or take turns using it.

Passengers say: Shoes off is OK (59 percent); sockless is not OK (87 percent). Not surprisingly, three-quarters of Italians, who come from the land of Gucci loafers and Salvatore Ferragamo pumps, turn their noses up at passengers who remove their footwear.

Lizzie says: "Out of consideration for other passengers, to the best of your ability we advise you to keep your shoes on while on the airplane."

Passengers say: If the person in the aisle seat is snoozing and you need to access the lavatory, do you wake him or her? Yes, according to 80 percent of surveyed subjects, but only once per trip, added 40 percent. A third said  they would steeplechase over the slumbering body but were torn over the best approach. More than half agreed on a face-to-face  exit strategy.

Lizzie says: "Absolutely wake the person up. When possible, the aisle person has an etiquette obligation to make it easy for the other people."

Passengers say: Bedtime stories should stay brief, according to more than 80 percent of travelers. Seatmates should exchange a quick hello and a smile, then zip the lip. Americans (42 percent) disapprove of sharing personal tales and will slip on headphones to cancel the conversation. Brits use the skip-to-the-loo excuse. Italian and French travelers are more magnanimous: 80 percent of Italians consider small talk appropriate, and half the French respondents consider flying a friendship-forging opportunity.

Lizzie says: "Brief chitchat is nice, but not obligatory. You can gauge if this is a good person to further the conversation with." To ease out of the situation, Lizzie suggests telling the person you are going to tuck into your book or listen to your music and pop in your earbuds.

Passengers say: On the topic of snoring, 66 percent said they won't nudge a nose-bugling neighbor, but will mute the noise by cranking up the volume on their entertainment system. However, 20 percent of Brits will give the offender a shove and then feign innocence.

Lizzie says: "Ignore it and block it out with your own entertainment system. Wax earplugs are great."