Airlines want new rules on rowdy passengers Please take your seats, and just chill out. Air travel can be far from relaxing. Bad passenger behavior is on the increase, according to airlines Aircraft captains and crew are reportedly worried they could be sued for assault if they take actions IATA wants to clarify the rules on unruly passengers (CNN) -- From a famous French actor accused of relieving himself in the gangway of a cabin to a unruly passenger that to be restrained on a flight from Iceland to New York last year, bad behavior on planes comes in a variety of forms. Carriers have said they face daily issues like passengers watching pornography, throwing drinks at cabin crew or being verbally abusive. But captains and crew are often worried they could be sued for assault if they take action in response. That's why the International Air Transport Association (IATA) wants to clarify what measurements are allowed to be taken in situations that aren't a clear safety threat. Airlines have reported over 15,000 incidents to IATA since it started collecting reports of bad passenger behavior in 2007. "It's something we need to tackle as an industry and across the globe," said IATA spokesperson Chris Goater. The association wants to address the issue at a diplomatic conference in Montreal in March, hoping for a global agreement on new guidelines. Golden days of flying a thing of the past The current legislation is based on the 1963 Tokyo Convention, which governs criminal offenses that pose as serious safety threats, but "the reality of today's industry is very different to that when the Tokyo Convention was developed," states IATA. We know by research that lack of space can cause stress or even anger and people can become territorial. Robert Bor, psychologist Psychologist Robert Bor, who has specialized in passenger behavior and fear of flying, agrees that much has changed since the 1960s. "In those days flying was dreamlike -- people would dress up to go traveling and the airline adverts reflected the actual experience," he said. Read this: How to battle the shrinking airline seat Bor thinks the increase in air rage can be explained by more efficient reporting on one hand, but also by looking at society in general. "It's evident that people are under a lot of pressure with their time and money," he said. He thinks the proposed revision of the Tokyo Convention is a step in the right direction. It is very important that we learn more about air range and that there is common policy between different countries about how to address it. Stealing wine and threatening crew But what really causes passengers to behave so badly on flights? Bor says there are many different factors coming together. If you look at air rage cases it's often a fairly ordinary person, and a trigger can be another person who might put their seat back, added with a bit of alcohol consumption and a fear of flying. Another factor could be the cabin layout and the environment in the aircraft. Abusing overhead bin space Taking ages to choose a movie Compulsive leg-shaking Boarding ahead of group number Babies crying Getting huffy when you leave seat Yacking on cell phone Bringing aboard stinky food Loud talking Establishing armrest hegemony Poaching shared middle seat Coughing, sneezing, germ sharing Playing games with sound on Wielding huge suitcases as carry-ons People behind trying to disembark first Cutting fingernails Baring feet Hogging toilets Reclining seat Kicking seat-back "We know by research that lack of space can cause stress or even anger and people can become territorial," said Bor. We might think of it as small trivial things, but actually we know that stress is cumulative. Read this: Airlines take the pain out of boarding planes What might be defined as rowdy passenger behavior can vary widely, and IATA has no grading system, says Goater. Many cases involve alcohol consumption, like a man reportedly stealing wine from a trolley to lock himself in the toilet to drink it. With a common policy Goater hopes passengers will then have a clear message of the consequences of acting up in the air. "The small minority that commit unruly behavior and acts will begin to understand the serious consequences of their actions as police authorities and courts will have the necessary legal tools to deal with them in adequate manner," he said.