Ryanair wants U.K. airport bars to tell passengers they’ve had enough.

The Irish low-cost carrier has called on U.K. airports to enforce a two-drink limit at airports and ban alcohol sales before 10 a.m. after BBC’s Panorama reported a 50% increase in the number of airline passengers arrested at airports for drunken behavior.

Ryanair also banned passengers from drinking duty-free alcohol onboard and prohibited travelers flying from Glasgow and Manchester to Alicante and Ibiza from bringing alcohol on board, the U.K. Independent reports. Alcohol-related arrests rose to 387 for the 12 months to February 2017 from 255 a year earlier.

On a Ryanair RYAAY, +0.33% flight from Manchester to Ibiza earlier this summer, one couple decided to either have sex or simulate sex in their seat. It was filmed by someone in the row opposite, while another passenger said the man asked other passengers if they had a condom. Ibiza is a well-known “party island.”

A Ryanair spokesman told the Daily Mail that the company does not tolerate “unruly, disruptive or inappropriate behavior.” The woman in the video subsequently described it as a “lap dance.” (A company spokesman did not respond to MarketWatch for a request for comment.)

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Airline travel experts find the latest incidents shocking, and there have been many lurid tales of passengers behaving badly in recent years. “Unbelievable,” says Christopher Elliott, author of “Scammed,” a book about how to avoid shady deals. “Definitely a new low.”

George Hobica, founder of low-airfare alert site Airfarewatchdog, added, “Maybe airlines need to have passengers acknowledge a code of conduct when they buy and when they check in for flights. Starting with ‘do not harass our team members and keep it in your pants.’”

Add the latest antics on Ryanair flights to the latest bizarre incidents of airline passengers behaving badly, and not just in the U.K. or due to alcohol-related behavior. An 80-year-old woman tossed nine coins toward the engine of a plane at Shanghai’s Pudong International Airport. One of the coins landed in the engine and the Airbus A320 aircraft was delayed for five hours, CNN reported in June. The woman, who was arrested, said she threw the coins for good luck.

What’s going on? No-frills airlines do lend themselves to more weekend travel and bachelor and bachelorette parties and, of course, some people like to start their vacations early. And with recent high-profile incidents where one passenger was dragged off a United Airlines UAL, +4.45% plane by security for not voluntarily giving up his seat, animals dying on flights and, in at least one case, a dog spending 33 hours in cargo due to a snafu over paperwork, some passengers appear to have lost respect for airlines. Even Nobel Prize-winning economists aren’t safe.

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Gone are the days when people sip a martini and make polite conversation about the weather and people’s health, and dress to the nines when they’re flying commercial, and these recent incidents in the U.S. and U.K. this spring don’t bode well for what passengers can expect this summer when more travelers take to the sky.

In 2016, airlines ranked seventh-to-last out of 43 industries in the American Customer Satisfaction Index. More than one-quarter of people (27%) described air travel as “awful” according to a January CNBC survey.

Airline passengers are grouchy. Seats on some American Airlines AAL, +4.41% forthcoming Boeing BA, +6.83% 737 Max jetliners will now come with two inches less legroom in coach. The “pitch” or distance between seats was previously 31 inches and will now shrink to 29 inches.

There has been a glut of arguments involving seat reclining. In one such incident, a male passenger reportedly had a “Knee Defender,” a $22 device that prevents the person in front of you from reclining their seat to take 40 winks. In retaliation, a woman threw a glass of water on him.

All niceties are forgotten at 40,000 feet. People sometimes squeeze more onto planes in an effort to avoid baggage fees, which can go as high as $225 or more for a third bag on Air Canada flights from the U.S. to Mexico, according to that airline’s policies listed online.

Add to that the long lines long lines in airports to go through security during peak summer travel times and reports of a possible ban on electronic devices on international flights by the Trump administration.

Improving the experience starts with the person holding your ticket, according to Jacqueline Whitmore, founder of the Protocol School of Palm Beach, Florida, who is also a former flight attendant. “Always alert the flight attendant to problems,” she says. She learned this the hard way after asking a mother, “Will you please control your children?” Her mother’s response was too colorful to be repeated here.

Other tips: don’t try to fit the kitchen sink into the overhead compartment, go easy on the cologne (and garlic and onion), carry deodorant and breath mints.