Why do airlines serve tomato juice so often?

For many travellers, ordering tomato juice on a flight is almost a ritual. It is one of the few drinks that seems to have a loyal following in the air, even among people who rarely touch it on the ground. Airlines around the world continue to stock it alongside coffee, tea and soft drinks, and cabin crews say it remains one of the most-requested non-alcoholic beverages.

So why does tomato juice become so appealing at 35,000 feet? The answer lies less in tradition and more in the way our bodies experience taste inside an aircraft cabin.

Your taste buds change in the air

Commercial aircraft cabins are pressurised, but not to sea-level conditions. The lower air pressure, reduced humidity and constant background noise all affect how we perceive flavour.

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Studies have found that sweet and salty tastes become noticeably weaker during a flight. Dry cabin air can also reduce the sensitivity of our taste buds and sense of smell, making foods and drinks seem blander than they would on the ground.

Tomato juice, however, relies heavily on umami—the savoury taste found in ingredients such as tomatoes, mushrooms and Parmesan cheese. Unlike sweetness or saltiness, umami is much less affected by cabin conditions. As a result, tomato juice can taste richer, fresher and more balanced in the air than it does at sea level.

The science of umami

Tomatoes are naturally rich in glutamates, compounds responsible for umami. That savoury flavour becomes more prominent when other taste sensations are dulled.

Researchers have also suggested that the constant low-frequency hum of aircraft engines changes how our brains interpret taste. While sweet flavours become less intense, umami flavours appear to remain satisfying or even seem enhanced. This is one reason why many passengers suddenly develop a craving for tomato juice during a flight, despite never ordering it elsewhere.

The same science also explains why a Bloody Mary has long been considered a classic in-flight cocktail. The tomato juice provides a full-bodied flavour that holds up well despite the unusual conditions inside the cabin.

It's practical for airlines too

Tomato juice isn't just popular because of science. It is also a practical choice for airlines.

It is shelf-stable, easy to store and suitable for a wide range of passengers, including those looking for a non-caffeinated or non-carbonated drink. It also pairs well with many in-flight meals without overwhelming the palate.

Because travellers continue to order it frequently, airlines have little reason to remove it from their beverage carts. In fact, several airlines have reported serving millions of litres of tomato juice over the years, making it one of their most unexpectedly popular drinks.

More than just a travel tradition

Tomato juice's popularity in the sky is one of those quirks where science and habit meet. Changes in cabin pressure, humidity and noise subtly reshape our sense of taste, making savoury flavours stand out while sweeter drinks lose some of their appeal.

So the next time you notice someone asking for tomato juice before the meal service begins, it is probably not because they suddenly became a fan overnight. At cruising altitude, that humble glass simply tastes better than it does back on the ground.