Most passengers settle into their seat, flip open the tray table, and order whatever sounds good from the menu without giving it a second thought. The food arrives, the drink cart rolls by, and that’s that. What few people realize is that the cabin crew serving those meals often quietly registers concern – or quietly skips the very items they’re handing out. Flight attendants spend more time in the air than anyone, and what they choose not to eat or drink speaks volumes. Here’s what they say raises red flags, and why the science backs them up.
1. Coffee and Tea: The Hot Drinks With a Hygiene Problem
Coffee and tea may seem like essential travel companions, especially on early or overnight flights. Former flight attendant Alex Quigley warns that airplane water tanks, used to brew these beverages, are not always regularly cleaned. “There’s no telling how often or when the tank has been cleaned last,” he explains. Even more startling, Quigley revealed that crew were usually instructed to pour leftover coffee out into the toilet rather than into the airplane drain, and that he never knew or saw anyone empty and refill or wash the coffee pots out between trips.
The Center for Food as Medicine and Longevity’s 2026 Airline Water Study found that water used aboard many U.S. airlines may contain traces of coliform bacteria or E. coli. The study evaluated 10 major and 11 regional carriers using Environmental Protection Agency records submitted under the Aircraft Drinking Water Rule between October 1, 2022, and September 30, 2025. While water is technically heated to near-boiling temperatures to brew coffee and tea, that’s not always enough to guarantee safety – especially when altitude changes the boiling point, making even boiling less effective when you’re miles above the ground.
2. In-Flight Meat Dishes: A Storage Gamble Nobody Wants to Take
Meat dishes are particularly risky on flights. Former flight attendant Quigley explains that delays and storage issues can compromise cooked meals, potentially leading to foodborne illness. Since food is prepared on the ground hours before it is consumed, it is exposed to varied temperature zones, from airport kitchens to airplane galleys where refrigeration options are often limited. The quality and safety of food can degrade during transportation, storage, or in-flight service, heightening the risk of foodborne pathogens.
In 2024, a Delta Airlines flight heading to Amsterdam from Detroit was forced to make an emergency landing in New York because passengers had eaten moldy chicken which caused them to become ill in flight. In another incident from 2024, travelers flying from Guam to Tokyo experienced severe food poisoning, with some vomiting and others needing to be hospitalized after landing. The confined nature of airplane travel makes foodborne illness outbreaks especially challenging to manage, according to Darin Detwiler, a food safety adviser at Northeastern University.
3. Multiple Alcoholic Drinks: What the Crew Is Really Calculating
The cabin pressure in an airplane is typically equivalent to the pressure at 6,000 to 8,000 feet above sea level. This reduced pressure environment decreases the availability of oxygen – a condition known as hypoxia – which can enhance the intoxicating effects of alcohol. Research published in the journal Thorax in 2024 found that sleeping in airplane cabin pressure made blood oxygen levels lower and heart rates higher compared to sleeping at normal air pressure, and combining drinking and sleeping in airplane cabin pressure made oxygen levels even lower and heart rate even higher.
A Global Rescue Traveler Sentiment and Safety Survey reveals that roughly six in ten travelers believe alcohol consumption should be managed by trained professionals such as flight attendants. That number has risen from a lower figure in December 2024, reflecting a shift toward trusting crew judgment rather than relying on rigid drink limits. The same survey found that the vast majority of travelers – close to nine in ten – said flight attendants should have firm authority to refuse service when needed. In 2024, the aviation industry saw a significant increase in disruptive passenger behavior, putting crew members at risk and causing flight delays and serious safety concerns.
4. High-Sodium Snacks and Fried Foods: Dehydration in a Bag
Air travelers should avoid high-sodium foods like instant noodles, salty snacks, and processed meats. Salty snacks like pretzels can make a flight passenger feel “thirsty, bloated, and sluggish.” Fried foods, such as onion rings, chicken nuggets, or anything with a breaded exterior, should also be avoided on a plane. They go soggy quickly, don’t reheat well, and often release a greasy aroma that spreads fast in the cabin.
The consumption of carbonated beverages can result in increased gas production at altitude. The pressure changes can cause the carbonation to expand more than usual, potentially leading to discomfort and bloating for those who enjoy these drinks. Airplane cabins are notoriously dry, with humidity levels often below 20%. This low humidity can lead to dehydration, which is further exacerbated by alcohol consumption, as alcohol is a diuretic that increases urine production. When combined with the already dehydrating environment of an airplane cabin, drinking alcohol can lead to significant dehydration.
5. Egg Dishes and Strong-Smelling Foods: A Confined Space Problem
Dishes made with eggs, like omelets or egg salad, are best avoided in-flight. “Even when prepared fresh, they tend to give off a strong scent once reheated, which can quickly fill a confined cabin space,” etiquette expert and former flight attendant Jacqueline Whitmore said. “Not everyone is tolerant of that smell, especially on long-haul flights. It lingers and can make nearby passengers feel nauseated.” Strong-smelling snacks have been described by one anonymous flight attendant as items that “stink the second you open the package.” Odorous foods can irritate other passengers in the confined space of an airplane.
As Whitmore put it, “At 35,000 feet, your body, your taste buds and even your digestive system behave differently – so what sounds good on the ground might not sit so well in the sky. Not to mention, smells tend to travel, too.” Three of the key environmental factors that have been shown to play havoc with the passenger’s ability to taste at altitude are the reduced cabin air pressure, the lack of humidity, and the loud background noise of the plane’s engines.
6. Tap Water and Anything Made With It: The Invisible Risk
Former flight attendant Kat Kamalani stated that “Rule number one” is “never consume any liquid that is not in a can or bottle,” dubbing the hot water machines on planes “disgusting” and noting they are next to the toilets on aircraft. The Association of Flight Attendants-CWA has expressed concern that current EPA standards don’t go far enough, stating that “the regulation gives broad discretion to airlines on how often they must test the water and flush the tanks” and that the regulation “is not sufficiently enforced.”
Dr. Cedric Spak, an infectious disease specialist at Baylor University Medical Center, stated he wouldn’t worry much about drinking airplane coffee, but he would not suggest someone with a compromised immune system drink a glass, and he would think twice before filling a baby bottle with water from an airplane tank. Foods that require refrigeration, like dairy products or cold seafood, may not always be stored at the correct temperature throughout a long flight, increasing the risk of bacterial growth. The safest move, according to multiple crew members and researchers alike, is to stick to sealed bottles and bring your own shelf-stable food whenever possible.
