In aviation, a pre-flight (or preflight inspection) is a rigorous, mandatory safety process conducted by the pilot before an aircraft is cleared for takeoff. This involves a systematic "walk-around" and internal check using a standardized checklist to ensure the machine is airworthy. During the exterior walk-around, the pilot inspects the fuselage for dents, checks the propeller for nicks, and verifies that flight control surfaces like ailerons and flaps move freely. They also drain a small sample of fuel to check for water or contaminants. Internally, the pilot checks the weight and balance, verifies instrument settings, and ensures all paperwork—such as the airworthiness certificate—is on board. In 2026, many of these checklists have transitioned to digital tablets (EFBs), but the fundamental goal remains unchanged: to catch any mechanical or structural issues while the plane is still on the ground. A professional pre-flight is the first and most crucial line of defense in aviation safety.