Seasoned travellers may be well versed with the rules of airport etiquette, but too many still risk faux pas that experts say are immediately off-putting. With the school summer break officially underway, airports across the UK will be very busy. This means that considerate and mindful behaviour can go a long way in setting you apart from other holidaymakers, said former royal butler Julius Smith. According to the etiquette expert, sinking too many pints before your early morning flight, blatant queue-barging and having loud conversations on your phone in public are among the worst things to do at the airport. Speaking to the Daily Mail, Julius said 'the glory days of air travel' are firmly behind us, adding: 'We've all seen the black-and-white photos of movie stars at the airport, dressed elegantly, with a baggage handler trailing behind, overseeing a dozen cases.'Travelling today could not be more different from those bygone days. To make matters worse, the behaviour of many passengers at airport terminals and on board planes can be downright shocking.' Outlining the dos and don'ts every conscious traveller should follow at the airport, Julius also gave his verdict on common dilemmas - including whether it's ever okay to remove your shoes and what airport-appropriate dressing looks like. Seasoned travellers may be well versed with the rules of airport etiquette, but too many people still risk faux pas that experts say are immediately off-putting (stock image)Don't...Take your shoes off at the boarding gate We all dread being told to take our shoes off at the security scanners; that's one thing. But when did it become acceptable to take your shoes off while waiting to board, asked Julius. 'Can you imagine anything less hygienic than walking around barefoot or in socks where thousands of other people have been?'Chug pints at 6am Much like Ryanair boss Michael O'Leary, Julius cannot stomach the idea of early-morning drinking before takeoff. 'Personally, I find it baffling that anyone would want a drink at that hour,' Julius said. 'Imagine sitting next to someone at 7 am, inhaling the smell of beer and spirits. If you can't wait until a more civilised time to drink, at least do so in moderation.' In May, Mr O'Leary said the early morning airport pint should be banned, adding the problem of drunken, aggressive passengers misbehaving is getting worse. He told The Times: 'I fail to understand why anybody in airport bars is serving people at five or six o'clock in the morning. Who needs to be drinking beer at that time?'He added: 'There should be no alcohol served at airports outside [those] licensing hours.'Queue-jumping in the airport lounge If you've been fortunate enough to travel first or business class, you'll have spent time in the airport lounge. However, these days airports have set up lounges for any passenger willing to pay an entry fee, said Julius. 'While most people behave well, some seem to think that queuing at the buffet doesn't apply to them, believing that paying entitles them to go ahead of everyone else. 'The airport lounge is exactly the place where good manners should be on display,' said the former royal butler. Crowd the baggage belt One of the most overlooked aspects of airport etiquette is how you behave at the baggage belt - and not everyone agrees with the best way to collect your luggage. Julius said: 'Why do people need to stand inches from the carousel as the bags go round? There's room for everyone. 'All you need to do when you spot your bag is politely ask someone to step aside, collect it, and then vacate the area.'Earlier this year, an American passenger sparked a heated online debate after being branded 'rude' for simply collecting her luggage from an airport carousel.A passenger took to Reddit to share her shocking encounter, asking other users whether she was in the wrong after a fellow traveller called her out for bad etiquette.The confused passenger revealed how a young college student confronted her for collecting her four bags as they arrived on the carousel, rather than 'walking down there to pick them up.''My four large bags quickly came off the carousel,' the traveler explained in the Reddit post.'As I approached the carousel, I grabbed my first one, then my second one, third, and fourth came down the chute quite quickly.'But what should have been a routine baggage collection turned into an unexpected confrontation.'When I went to grab the fourth bag this young college girl said that I was being rude picking up my bags. She said why can't you walk down there to pick them up. We were all standing at the same spot for five mins before my luggage came off.'The incident has sparked a flurry of responses from fellow travellers, with many rushing to defend the woman's actions.The consensus seemed clear - the complaining student was actually the one breaking baggage claim etiquette by crowding the area after someone else's bags had arrived.'She is absolutely the rude one continuing to crowd the area after someone's bag has arrived,' one experienced traveler explained.Dress in loungewearThere should be a compulsory dress code at the airport, Julius argued, noting: 'Standards have dropped so far that you really do wonder where it will all end. Casual but smart should be on everyone's mind when they travel.'The Etiquette Queen, Laura Windsor previously told the Daily Mail that while pyjamas are an absolute no-no, her list of what not to wear to the airport extends beyond nightwear. This includes sleeveless t-shirts, flip flops, large hats, and anything 'overly revealing'. 'Who wants to see too much body hair or sweaty armpits?' she questioned. 'Flip flops are reserved for when you are on the beach or at the poolside.' She added: 'It is a public space, such that outdoor wear is the only appropriate attire unless you are a two-year-old and travel around in a buggy.' Check in too far in advance While you don't want to be rushing to make your flight, Julius said there is such a thing as arriving for your flight too early. He explained: 'I've always been in the camp of arriving at the airport early; you never know what might go wrong on the way. Some people, though, take it too far, turning up five hours ahead and demanding to check in.' The best thing to do is to follow the airline's guidance and give yourself plenty of time, according to the etiquette expert. Do...Wait patiently to board Julius admits that waiting at the boarding gate can be the most tedious time at the airport. However, he said, that's no excuse for bad behaviour. 'There are two types of people: those who insist on standing the moment the gate opens, and those who like to play it relaxed and only stand up at the last moment. I'm firmly in the latter camp; the plane isn't going anywhere until everyone is on board, so there's no desperate need to be at the front of the queue,' Julius continued. 'It also drives me mad when people board and don't quickly stow their belongings in the overhead bins; we all have a duty to keep things moving at a decent pace. 'And it never fails to amaze me why passengers leap up the second the plane lands and parks; they're not getting off any quicker.'Use headphones According to Julius, listening to music or taking video calls without headphones should be 'outlawed by airline authorities'. There's a reason electronics shops are always found in the duty-free area; they're there for passengers who've forgotten their headphones.Laura previously told the Daily Mail it is 'unacceptable' to blast your music or tv shows without consideration for fellow passengers.