Why is Diet Coke not allowed on a plane?

In a 2013 blog post that continues to make the internet rounds, the flight attendant noted that because the average airplane cabin is pressurized to the equivalent of about 8,000 feet instead of sea level, soft drinks foam up more when poured out of a can. The worst culprit for this is Diet Coke,'' he wrote.



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“Most flight attendants won't drink the tap water, coffee or tea,” she added, noting that caffeinated drinks also dehydrate you – another reason to avoid them while travelling. And before you put ice in your drink, think again. That is also often made using the very same tap water.

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In response to a historic uptick in reported incidents of unruly and disruptive — and sometimes intoxicated — passengers, many airlines banned alcohol on flights during the COVID pandemic. The FAA investigated over 1,000 cases of unruly passengers in 2021 alone — more than the five previous years combined.

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It should come as no surprise that the healthiest thing to drink on a plane is water, which also happens to be the healthiest thing to drink on land. Inside an airplane cabin, the air is extremely dry, putting you at heightened risk of dehydration. That can lead to nausea, headaches, and other unpleasant outcomes.

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Because the effects of air travel dull down the sweetness in the ginger ale, its other flavors are allowed to shine, making the drink taste drier—and more refreshing—than it does back on the ground, she explains. “It gives off a more refreshing and sophisticated taste,” Redwine confirms.

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So you can't bring H20 or any other liquids more than 3.4 oz. (well there are some exceptions) through security, but you CAN bring an empty bottle. Just fill it up on your way to boarding your flight after screening.

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You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes in your carry-on bag and through the checkpoint. These are limited to travel-sized containers that are 3.4 ounces (100 milliliters) or less per item.

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You are allowed to bring a quart-sized bag of liquids, aerosols, gels, creams and pastes through the checkpoint. These are limited to 3.4 ounces (100 milliliters) or less per item. This is also known as the 3-1-1 liquids rule.

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Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.

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It can be tempting to load up on caffeine or alcohol to pass the time while in the air—but avoiding the temptation will help keep you hydrated and make it a whole lot easier to fall asleep when it's time for lights out. It's better to drink herbal tea to achieve a soothing effect and sleep better on the plane.

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Tomato juice has a strong flavour that can still be tasted at high altitudes, making it a satisfying beverage choice for passengers. Additionally, tomato juice is a good source of hydration, which is especially important during air travel, as the cabin environment can be dehydrating.

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The dry cabin air messes with our odor receptors, and since things taste differently when our sense of smell is impaired—think about eating when you have a cold—food tastes blander on a plane than it does on the ground. That same principle is what makes tomato juice taste better in the air.

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