Airport engineering involves the planning, design, construction, and operation of airports. Unlike highway or railway projects, airports must integrate massive geometric infrastructure for aircraft with complex terminal facilities for passengers and freight, all while adhering to strict international safety regulations.

An airport master plan is a comprehensive study that describes the short-, medium-, and long-term development plans to meet future aviation demand. It relies on forecasting the types and volumes of aircraft that will use the facility.

Runways must be oriented to maximize the time aircraft can take off and land directly into the wind, which provides critical lift and control. A wind rose is a graphical tool used to analyze wind data (direction, velocity, and frequency) collected over many years at the airport site.

The primary runway is aligned in the direction of the prevailing wind. The Federal Aviation Administration (FAA) requires that the primary runway (or a combination of runways) provide at least 95% wind coverage. If the primary runway cannot achieve 95% coverage due to strong crosswinds from varying directions, a crosswind runway must be built.

The required length of a runway is primarily determined by the performance characteristics of the "critical design aircraft" (usually the largest or heaviest plane expected to use the airport regularly).

Aircraft manufacturers provide the basic required runway length under standard sea level conditions (0 elevation, 59°F/15°C, 0% gradient). However, real-world conditions vary significantly, and engineers must apply three sequential corrections to this basic length ($L_B$) to calculate the actual design length ($L_{actual}$).

As elevation increases, air density decreases, meaning aircraft engines produce less thrust and wings generate less lift.

Let $L_1$ be the length after the elevation correction.

Hot air is less dense than cold air, further reducing performance. This correction uses the Airport Reference Temperature ($ART$), which is the average maximum temperature of the hottest month.

Let $L_2$ be the length after both elevation and temperature corrections.

Taking off uphill requires more runway length than taking off on a flat surface. This correction uses the effective runway gradient ($G$), defined as the maximum difference in elevation between the highest and lowest points on the runway divided by the total length.

This yields the final actual design length ($L_{actual}$).

Airport geometry is explicitly designed to safely accommodate the "Critical Aircraft"—the largest, most demanding aircraft expected to use the facility regularly.

Airport design globally is governed by two primary bodies:

The airspace surrounding an airport is strictly classified by the FAA (Classes A through G) to manage the density and speed of traffic. Class B airspace covers high-altitude en-route flights, while Class B, C, or D surface areas protect the immediate vicinity of airports depending on their commercial volume.

To navigate this airspace and land safely, especially in IMC, airports rely on Navigational Aids (NAVAIDs):

Aircraft noise is the most significant obstacle to airport expansion. Engineers use the Day-Night Average Sound Level (DNL) metric to quantify noise exposure, placing a 10-decibel penalty on flights occurring between 10 PM and 7 AM to account for sleep disturbance.

The airfield layout is governed by strict geometric standards defined by the FAA based on the Airport Reference Code (ARC), which classifies airports according to the approach speed and wingspan of their critical design aircraft.

While the airside focuses on aircraft movements, the Landside focuses on the transfer of passengers and freight between the ground transportation network and the aircraft. The passenger terminal building is the central node of this transition.

Aircraft manufacturers provide basic runway length requirements based on standard sea-level conditions. The design engineer must apply three sequential corrections to the manufacturer's basic runway length ($L_{basic}$) to find the actual required design length ($L_{actual}$).

Let $L_1$ be the length after the elevation correction.

This correction uses the Airport Reference Temperature (ART), calculated from the hottest month of the year.

Let $L_2$ be the length after both elevation and temperature corrections.

Taking off uphill requires more runway length.

This yields the final actual design length ($L_{actual}$).

Unlike cars, aircraft generate lift by moving through the air. Taking off or landing directly into a headwind dramatically reduces the ground speed required to achieve flight, reducing required runway lengths and increasing safety. Conversely, a strong crosswind makes controlling the aircraft extremely difficult.

If the primary runway cannot achieve 95% coverage due to shifting seasonal winds, a crosswind runway must be constructed at an angle to the primary runway. Engineers determine orientation using a Wind Rose: a graphical tool plotting historical wind speed and direction data on a polar coordinate system to find the orientation encompassing the maximum percentage of wind observations.