When headed out on or returning from holiday, the flight should simply be the first step towards a relaxing time away from home, or a chance to unwind before settling back into normality.But somewhere in between boarding a flight and landing, it seems some travellers have forgotten that they’re sharing a cabin with a hundred or so other people.Gone are the days when the biggest in-flight grievances were crying babies, overly reclined seats and armrest hoggers. Instead, there’s a new wave of irritating habits creeping into the cabin.From filming TikToks to attempting yoga stretches or deciding it’s time for a manicure, there’s no shortage of ways that passengers have found to test the patience of their cabinmates.According to new research from Booking.com, nearly half of Brits believe passengers are becoming far too comfortable at 30,000ft, with many treating the cabin as an extension of their own living room.The findings also reveal a surprise contradiction. Despite almost nine in ten travellers (89 per cent) believing people should behave on a plane as they would on any other form of public transport, around two thirds (67 per cent) still admit they behave exactly as they do at home once in the air.This overly relaxed attitude appears to be the exact reason behind this new host of frustrations. New research from Booking.com has revealed that nearly half of Britons feel tat passengers are too comfortable at 30,000 feet in the air – with watching videos without headphones being the most irritating habitAccording to Booking.com’s research, the habit that most irritates passengers is watching videos without headphones, with 43 per cent saying there’s nothing more annoying than being forced to listen to someone else’s film, music, or social media feed.Plenty of travellers have complained about this online.One Reddit user wrote: ‘I just can’t understand why they think this is okay to do. If I’m listening to music or a video and it starts playing out loud I’m so embarrassed. And some people act like it’s normal.’Another user, who works as a flight attendant, reiterated the widespread nature of the problem, saying ‘at least once a work day I am guaranteed to have to ask a passenger to put their device on mute or use headphones.’Half of them have the audacity to scoff and look at me like I’m inconveniencing them! Once I even had a guy pull out his Bluetooth speaker and start playing music.’The same number of people said bringing a strong-smelling or messy meal on board is equally irritating, proving that what passengers eat can be just as loathed as what they are listening to.Sushi took the top spot as the most offensive (38 per cent), with garlic-heavy dishes (32 per cent) and boiled eggs (31 per cent) being other strong contenders for meals that should stay firmly on land. Sushi took the top spot as the most offensive meal for passengers to bring on board, with 38 per cent saying they found it detracted from their in-flight experienceMore than four in ten (42 per cent) said they disliked people leaning across them to take photographs or videos out the window, while a third (33 per cent) named filming TikToks or social media content among the most annoying passenger behaviours.For many, though, it’s not just the filming that’s the problem – it’s ending up in someone else’s holiday content.Three in ten (30 per cent) said they found themselves getting caught in the background of strangers’ videos, whether they wanted to or not.And it seems social media isn’t the only trend making its way into the skies – fitness goals have also begun to infiltrate.Almost a quarter (24 per cent) said they have encountered passengers walking up and down the aisle to hit their daily step count, while 23 per cent have seen travellers using the limited cabin space to stretch, or even practise yoga. According to Booking.com, some 24 per cent of people have encountered other passengers using limited cabin space to stretch, or even practise yogaEven dental hygiene is not immune from criticism, with 18 per cent of people saying they’ve been irritated by fellow passengers using floss on the flight.If this all sounds too familiar, that’s because these are just a few from a lengthy list of travelling behaviours that continue to divide opinion.Indeed, some of these behaviours have even earned their own labels. ‘Luggage loungers’ – passengers who create human traffic jams by waiting for their bags right by the carousel – have been branded one of the newest airport nuisances. And those who leap into the aisle the moment the seatbelt sign is switched off, despite the plane not having moved, are also coming under fire. They have even earned the nickname ‘aisle lice’. Despite these frustrations, most Brits would rather suffer in silence than risk an awkward confrontation, with 31 per cent admitting they would simply tolerate irritating behaviour rather than muster up the courage to ask another passenger to stop.A further third confessed they’d simply wait until landing to vent to friends and family instead.Laura Windsor, Booking.com’s etiquette expert, said the shift reflects changing attitudes towards travel: ‘Flying has always been a shared experience, but what we’re seeing now is a shift towards people treating it more like their own personal space.’Comfort is important, especially on longer journeys, but it should never come at the expense of those around you.’