What Aerospace Engineers Actually Do

Aerospace engineering is the discipline of designing, analyzing, and testing aircraft, spacecraft, and the systems that make flight possible — applying mechanical engineering's core physics (structures, fluids, thermodynamics, materials) specifically to the extreme, safety-critical demands of atmospheric and space flight, where the margin for error is smaller and the consequences of failure are typically catastrophic. Aerospace engineers work on everything from commercial airliners and military aircraft to satellites, launch vehicles, and increasingly, drones and urban air mobility (eVTOL) aircraft.

The discipline is traditionally split into two branches: aeronautical engineering, focused on vehicles that operate within Earth's atmosphere (aircraft, drones), and astronautical engineering, focused on vehicles that operate in space (satellites, launch vehicles, spacecraft). Most university programs today combine both under a single "Aerospace Engineering" degree, with specialization happening through electives and, eventually, the specific industry sector an engineer enters — commercial aviation, defense, or the growing commercial space sector each demand meaningfully different specialized knowledge on top of the shared foundation.

The Core Sub-Disciplines

  • Aerodynamics — how air flows around a vehicle and generates the lift and drag forces that determine flight performance, studied through both computational fluid dynamics (CFD) and wind tunnel testing.
  • Propulsion — the engines and systems that generate thrust, spanning jet engines and turbofans for aircraft to rocket propulsion for spacecraft and launch vehicles — a genuinely distinct engineering specialty from general mechanical propulsion given the extreme performance and reliability demands.
  • Structures and materials — designing airframes and spacecraft structures to be as light as possible while safely surviving flight loads, a discipline that drives much of aerospace's historical leadership in advanced composite materials.
  • Guidance, navigation, and control (GNC) / avionics — the control systems, sensors, and electronics that keep an aircraft or spacecraft stable and correctly guided, overlapping significantly with controls and electrical engineering.
  • Systems engineering — aerospace vehicles are among the most complex engineered systems that exist, and dedicated systems engineering (integrating structures, propulsion, avionics, and every other subsystem into one working, verified vehicle) is a major, distinct specialization within the field.

How Aerospace Engineering Relates to Mechanical Engineering

Aerospace engineering shares its core physics foundation with mechanical engineering — statics, dynamics, thermodynamics, fluid mechanics, and materials science all apply directly — but layers on specialized knowledge that general mechanical engineering doesn't cover in the same depth: high-speed and compressible aerodynamics, the extreme weight-optimization demands of flight structures, orbital mechanics for spacecraft work, and aerospace-specific regulatory and certification processes (FAA certification for aircraft, for instance) that don't have a direct equivalent in most other mechanical engineering work.

Tools and Skills

Aerospace engineers use general mechanical engineering CAD and FEA tools (CATIA is particularly dominant in aerospace/defense given its class-A surfacing and PLM integration strength) alongside specialized aerospace analysis software for aerodynamics (CFD tools like ANSYS Fluent), propulsion performance modeling, and orbital mechanics (for astronautical work). MATLAB and Simulink are heavily used for guidance, navigation, and control system design and simulation. Systems engineering roles increasingly rely on model-based systems engineering (MBSE) tools to manage the sheer complexity of integrating an entire vehicle's subsystems.

Career Path and Outlook

A 4-year, ABET-accredited aerospace engineering degree is the standard entry point, and given the industry's heavy defense and government contracting presence, many aerospace engineering roles in the US require security clearance eligibility (US citizenship, at minimum) even for non-classified work, simply due to the industry's structure. Aerospace engineering demand is currently being reshaped by significant growth in commercial space (driven by dramatically reduced launch costs), the emergence of urban air mobility and drone industries, and continued strong demand in commercial aviation and defense — giving the field several genuinely distinct growth areas beyond its traditional aircraft/defense core.