Every aircraft leaves behind invisible, spinning tubes of air called wingtip vortices. This wake turbulence can flip a smaller aircraft — which is why you see spacing between planes on approach. Here's how it works.
Wake turbulence is generated by every wing producing lift. As air flows over and under a wing, the pressure difference between the lower surface (higher pressure) and upper surface (lower pressure) causes air to curl around the wingtips, creating two counter-rotating vortices — one from each wingtip. These vortices spin at hundreds of revolutions per minute and can persist for 2–3 minutes after the generating aircraft passes. A heavy aircraft like a Boeing 747 or Airbus A380 generates vortices with velocities exceeding 25 meters per second — strong enough to roll a following medium-sized aircraft beyond its control authority if encountered at close range.
Aviation authorities require minimum separation distances based on the weight category of the leading aircraft. Behind a super-heavy aircraft (A380, An-124), following aircraft must wait 4–8 nautical miles depending on their own size. This wake turbulence separation is one of the primary factors limiting airport capacity during peak hours. The FAA's RECAT (Re-categorization) program updated these standards in 2014 using real-world turbulence measurements, improving capacity by 7–12% at major hubs without reducing safety.
If an aircraft encounters wake turbulence en route, passengers feel a sudden sharp roll or jolt that resolves within seconds as the pilots correct. At altitude, well-managed wake encounters are startling but not dangerous for the aircraft in question. The danger window is at low altitude during approach and departure, where recovery options are limited. Air traffic control actively manages this risk through separation rules, and pilots report wake turbulence encounters so warnings can be issued to following flights.
The most-cited wake turbulence accident is American Airlines Flight 587 (2001, JFK), where the first officer's excessive rudder inputs in response to wake turbulence caused the vertical stabilizer to separate. However, the NTSB determined the crash was primarily caused by the flight crew's inappropriate response, not the turbulence itself. Modern wake turbulence training emphasizes that pilots should not use aggressive rudder corrections in response to wake encounters. The aircraft encountered turbulence it could structurally handle — the control inputs exceeded the aircraft's structural limits.
Ranked by historical turbulence score — click any route for details