The FAA and international aviation bodies classify aircraft into several distinct "Categories" based on their intended use and certification. The broadest categories for Pilot Certification include: Airplane, Rotorcraft, Glider, Lighter-Than-Air, Powered Lift, Powered Parachute, Weight-Shift Control, and Rocket. Within the "Airplane" category, aircraft are further divided into "Classes" such as Single-Engine Land, Multi-Engine Land, Single-Engine Sea, and Multi-Engine Sea. From an Aircraft Certification standpoint, the categories describe how the plane is built and its safety limits: Normal (standard light planes), Utility (capable of limited maneuvers), Aerobatic (for stunts), Commuter (small passenger planes), and Transport (large commercial airliners). There are also "Special" categories like Experimental for amateur-built or research planes. Finally, for landing purposes, planes are grouped by Approach Category (A through E) based on their landing speed. For example, a Cessna is a "Category A" (slow), while a Boeing 737 is a "Category C." This multi-layered system ensures that pilots, engineers, and air traffic controllers use the same "grounded" definitions for safety in 2026.