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Use inside voices. Keep your hands to yourself. Use manners Eat the right things.

Article:
Whether you are travelling by family, couples or alone. It's important to practice using inside voices to avoid disturbing others around you. If you speak in a calm tone, it's a matter of fact that you will approach a stressful situation with a clear mind and a purer ability to reason. It may sound like a childish instruction but the important premise of keeping your hands to yourself while visiting shops and such, go a long way. It diverts you from handling something that might break, drop and who knows what else. Aim to only grab and carry things that you are certain to purchase in these shops. . Remember to use your magic words "Please" and "Thank-you", it is standard decorum, however sometimes people do forget when they are out of their comfort zones. Avoid consuming foods that may result in unforeseen bowel movements. You will most likely feel terribly uncomfortable while you wait in the terminal or during the flight; and in some cases, make the passengers in close proximity feel that way too. Rather than drink copious amounts of water prior to the flight, take regular small sips to ration out the likelihood of you needing to use the lavatory, depending on the duration of your flight.