Why Airplanes Have a Hidden “Expiration Date”

Did you know that airplanes don't have an odometer? Unlike your car, a commercial airliner’s lifespan is never measured in miles.
Instead, aerospace engineers measure a plane's life in "Flight Cycles." Every single time a jet takes off, pressurizes the cabin, and lands, it counts as one cycle. At 35,000 feet, compressed air is pumped into the sealed cabin to keep you alive. This pressure literally forces the airplane's aluminum skin to expand outward like a massive metal balloon. When the plane lands, it shrinks back down.
Over thousands of flights, this constant stretching creates microscopic metal fatigue. If ignored, tiny cracks can grow and cause catastrophic failures—just like Aloha Airlines Flight 243 in 1988, which suffered a massive mid-air fuselage tear after enduring nearly 90,000 flight cycles.

Did you know planes physically expand during a flight? Share your thoughts below!