In honor of National Pretzel Day yesterday, we’re chronicling the history of in-flight airplane snacks (since we all know that pretzels reign supreme when it comes to snacking while flying)! Believe it or not, snacks and meals on airlines actually began way back in the 1920s when jumbo-liners finally gained the space for kitchens and food storage. In an effort to provide the best in-flight experience, airlines clamored to offer the best onboard dining experiences. But with innovation comes iteration, and the snacks offered on flights have changed dramatically over the past 90 years. Take a look at all of the airline snack fads throughout the decades, from gourmet meals to trail mix and granola bars.

Have you ever experienced the effects of flying? The dehydration, strong emotions, achy joints and lack of clarity? There are few human inventions greater than the advent of air travel, but the truth is that human bodies weren’t made to fly. Being sealed in a metal tube 30,000 feet above the ground has physical effects (like dehydration) but also has some serious ramifications when it comes to your mood. Blame the cramped space or the radiation our bodies are absorbing, but there’s no denying that flying takes its toll every time we board a plane. These physical and emotional effects are unnerving, and they can also lead to added stress on our immune systems. If you’re taking a flight soon and want to remain as healthy as possible, read our guide to mitigating the ways that flying can mess with your mind and body.