Ensuring you're "fit to fly" is crucial if you have health concerns or are recovering from surgery. Whether it's for a chronic condition, a recent surgery, or a medical device like a cast, medical clearance may be required before your flight. Airlines often need a fit to fly certificate at least 48 hours before departure, especially if you're requesting special assistance or traveling in a medical escort, business, or first class. Read on to learn why obtaining medical clearance is essential for your health and safety when flying.