Airline food has improved by leaps and bounds over the last couple decades, but there are still a few items that remain mostly off the menu, for various reasons. Here are some of the ones experts told TPG you’ll rarely find on a flight.1. BroccoliBecause they contain sulfur compounds, cruciferous vegetables like broccoli give off an unpleasant odor that tends to fill a cabin when they’re heated. In addition, they (like beans) tend to give people gas and make them feel bloated.Of course, some people will be happy to hear there won’t be much broccoli on the flight. Image courtesy of PeopleImages via Getty Images.2. Fried FoodsThat toothsome crunch and crispiness that makes french fries, fried chicken and onion rings so fun and tasty? Don’t expect any of that in the air. By the time they’re ready to serve on a flight, these foods usually end up mushy and unpleasant.Your best bet for crispy fries on a plane? Buy them in the concourse. Image courtesy of Martin Jordan / EyeEm via Getty Images.3. PrunesThink about it: four to 18 bathrooms on a flight full of as many as nearly 853 passengers. Add an infamous laxative to the mix, and you’re just asking for disaster.Even if they are on the menu, avoid the prunes unless you’re in an aisle seat, please. Image courtesy of imagenavi via Getty Images.4. EggsNotorious among airlines for how difficult they are to get right, you’ll commonly see scrambled eggs or omelets on breakfast menus, but you’ll never see eggs sunnyside up, easy, medium or basically anything short of fully cooked. “Anything that requires a runny egg just dries out,” says Jamie Perry, Vice President of Marketing for JetBlue.No matter how you slice it, eggs dishes are not easy to pull of at 35,000 feet. Image courtesy of AlexPro9500 via Getty Images.5. Fresh BreadSure, flights always seem to have sandwiches or those Styrofoam-like rolls on hand, but you’re not going to get a classic baguette, crusty sourdough boule or crackly-skinned fougasse with silky-tender interior. Breads like those are best straight out of the oven and the logistics of airline service mean only a lucky few will get their fresh, hot breads in time to enjoy properly.Unless it’s coming straight out of an oven, you will not see bread like this (great crust, fluffy inside) on any airline menu. Image courtesy of LauriPatterson via Getty Images.On the Drink Menu: No Wines with Mineral FlavorsThat taste of slate or stone may be delightful at sea level, but at altitude, wine with strong mineral notes tastes less like rock and more like plain old dirt.Fans of mineral-forward wines should imbibe before or after their flight. Image courtesy of Corbis/VCG via Getty Images.And the one item you’re going to find on pretty much every flight in the world? Chicken, which is universally available, relatively inexpensive, healthy and lean and doesn’t transgress common religious or cultural prohibitions (unlike pork or beef).Yes, they already know: You’ll have the chicken. Image courtesy of Assalve via Getty Images.For more on the science behind airplane food, check out this in-depth report.Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.What foods and drinks do you never see on flights? What do you wish they’d put on the menu? What would you ban? Sound off, below!