Those fortunate enough to have summer travel plans after thousands of recent flight cancellations might pause during their airport visit. Instead of focusing on ticket costs, which are unlikely to drop soon, consider the runway surfaces visible from the terminal. The material beneath departing and arriving planes is rarely simple tar or macadam.

Major hubs like the nation's busiest facility rely entirely on concrete runways. JFK operates three concrete surfaces alongside one asphalt runway. Honolulu's primary airport uses only asphalt, while Chicago O'Hare incorporates concrete, asphalt, and hybrid sections. Such variation exists despite strict regulations because runway construction adapts to multiple practical needs.

Material selection hinges on expense, building timelines, climate conditions, and aircraft traffic levels. Concrete offers greater longevity under heavy use, whereas asphalt distributes landing and takeoff forces effectively across the surface. The differences become clear when examining engineering requirements.

How runways are engineered

Runway design addresses distinct stresses from takeoff and landing. Departing aircraft carry maximum fuel loads exceeding one million pounds, while arriving planes are lighter. Engineers must create surfaces that spread this weight to avoid cracking or deformation through multiple layered components.

Construction begins with prepared soil, followed by drainage layers that reduce water accumulation. A coarse sub-base supports heavy equipment during final paving. The base course hardens under load to transfer weight downward, while the surface course provides essential texture for braking and traction control.

Concrete manages these functions independently but proves expensive and vulnerable to rapid temperature shifts. It suits high-volume runways where extended service life matters most. Asphalt supplies texture and flexibility that withstands freeze-thaw cycles, allowing simpler repairs when sections reach the end of their useful period.

Runway safety remains essential, though unusual examples exist

Airport runways prioritize safe aircraft operations under FAA guidelines that mandate spacing standards and specialized arrestor systems resembling enhanced truck ramps for aircraft. These measures address nearly all potential landing scenarios at major facilities.

Smaller regional airports sometimes feature grass surfaces for private pilots. Barra Airport in Scotland permits beach landings, while Tenzing Hillary Airport in Nepal offers a short asphalt runway ending at a steep drop, serving as a gateway for mountain expeditions. These cases illustrate how runway materials and designs adapt to unique environments worldwide.