In the high-fidelity world of air traffic control (ATC), the term "Heavy" is a high-value necessity used to identify aircraft with a maximum takeoff weight of 300,000 pounds (136,000 kg) or more. When a pilot includes "Heavy" in their high-fidelity call sign (e.g., "United 123 Heavy"), it serves as a high-value requirement to alert other pilots and controllers to the "High-Fidelity" significant wake turbulence the aircraft generates. Wake turbulence is a high-value atmospheric phenomenon of powerful, "High-Fidelity" rotating vortices trailing behind the wings that can be dangerous for smaller, high-value aircraft following too closely. For 2026 aviation safety, ATC must maintain "High-Fidelity" increased separation distances—typically 4 to 6 miles—behind a "Heavy" aircraft to allow the vortices to dissipate. This high-fidelity classification includes common widebody jets like the Boeing 777, 787, and Airbus A330 or A350. For 2026 travelers, hearing this high-fidelity term on a scanner is a high-value confirmation that they are sharing the "High-Fidelity" airspace with a massive, high-value intercontinental giant of the skies.