How Flying Works
What Happens When Lightning Strikes a Plane?
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Somewhere in the world right now, an airliner is statistically due to be hit by lightning. Estimates vary, from about once every 1,000 flight hours (an FAA figure often quoted) to once every 3,000 (Airbus), but either way the average airliner is struck about once a year. Almost none of these strikes make the news, cause damage, or even change the flight’s course. That isn’t luck, and it isn’t because pilots always avoid storms perfectly. It’s a deliberate engineering answer, decades old, to a problem aviation once learned the hard way: an accident that killed 81 people and changed how every aircraft built since is designed.
The crash that changed the rules
On the night of 8 December 1963, Pan Am Flight 214, a Boeing 707 named Clipper Tradewind, was circling in a holding pattern near Elkton, Maryland, waiting to land at Philadelphia in bad weather. At 8:58pm, lightning struck the aircraft and set fire to fuel vapour inside its No. 1 reserve fuel tank. Nothing in the structure failed. The vapour in that tank simply happened to be flammable when the strike’s energy found a way in. The explosion tore off the outer part of the left wing, and the aircraft crashed two miles from Elkton less than a minute later. All 81 people on board were killed. The US Civil Aeronautics Board’s investigation concluded plainly that lightning ignited the fuel-air mixture in that tank. It remains the best-known case of lightning destroying a jet airliner, and it prompted research into fuel-system design and lightning protection that shaped the rules airliners are built to today.
The aircraft is its own lightning rod, on purpose
A jet’s aluminium skin acts as a Faraday cage: a closed, conductive shell that spreads an electrical charge over its outside instead of letting it inside. Composite aircraft like the 787 or A350 get the same effect from copper mesh built into the skin. The current in a strike is enormous: up to about 200,000 amps, at around 30,000°C, hotter than the surface of the Sun. It enters at one point, usually the nose or a wingtip, and runs across the skin to leave at another. That’s usually a small metal static wick sticking out from the wing or tail, built as an easy exit, so the current has an obvious, low-resistance path off the aircraft.
Animated
Where the lightning actually goes
Flying near a storm: The aircraft builds up static charge as it flies through charged cloud. Passengers may see a flash and hear a bang, but the current stays on the outside of the aircraft. Schematic, seen from above.
Every metal part of the aircraft, from control surfaces and engines to access panels, is electrically bonded together with straps and connectors. That gives the current one continuous path, so separate parts can’t spark against each other as the charge passes through. The one place a spark would be catastrophic, inside a fuel tank, where Flight 214’s explosion began, gets extra protection. Tanks are built and sealed to strict lightning-protection rules, and many modern aircraft also feed nitrogen-enriched air into their tanks to remove the flammable mixture a spark could ignite. Together, those changes closed the exact failure that brought down Flight 214 six decades ago.
The real numbers
Lightning strikes, in real numbers
~1 per year
Average strike rate
Per commercial aircraft; sources range from 1 per 1,000 to 1 per 3,000 flight hours.
up to 200,000A
Peak current
A single strong strike, far beyond household wiring scales.
~30,000°C
Channel temperature
Hotter than the sun's surface — travels across the skin, not through the cabin.
8 Dec 1963
Best-known lightning loss
Pan Am 214, near Elkton, MD — an accident that spurred fuel-system and lightning-protection work.
What actually happens on board when it strikes
Inside the cabin, a strike is usually a bright flash and a loud bang, and it can startle passengers who don’t know what happened. The crew follows a checklist, not a panic. They check that the flight instruments and engines are working normally, note roughly where the strike hit if they can see it, and carry on unless something abnormal shows on their displays, which is rare. After landing, engineers carry out a dedicated inspection. They look for burn marks where the current entered and left, any pitting in the structure, and damage to composite panels, which can be harder to spot than damage to metal. Only then is the aircraft cleared to fly again. In the vast majority of real strikes, the flight never needs to divert or declare an emergency.
Sources & Further Reading
Common Questions
Frequently Asked Questions
Can lightning bring down a plane today?
Essentially never, and that's a direct result of the 1963 accident changing the rules. Since lightning protection, bonding and fuel-tank safeguards became standard across the industry, a lightning-caused loss of a modern airliner is extremely rare.
Do passengers feel or notice a strike?
Often, yes. A bright flash and a loud bang are common, and they can be startling. But the current is designed to travel across the outside of the aircraft’s skin and leave through a static wick. It never enters the cabin or touches anyone inside.
Does the plane have to land immediately after being struck?
Not necessarily. The crew runs a checklist to look for any damage, and airlines require an engineering inspection after a strike before the next flight. But a strike isn’t automatically an emergency. Many go unnoticed by passengers, and the flight just carries on.
Are some parts of a flight more dangerous for a strike than others?
Yes. Most strikes happen during the climb or descent, as the aircraft passes through cloud at about 5,000–15,000 feet. That’s where electrical charge builds up most in storm clouds, rather than at cruising height above the weather.
Last reviewed: October 2026. Facts that change, such as fleets, airspace and airline ownership, are re-checked on a schedule. Spotted an error? Email contact@skyplus.news and we’ll fix it. See how we check facts.