Final answer:
Jet routes are typically found in Class A, B, and C airspace.
Step-by-step explanation:
Jet routes are typically found in Class A, B, and C airspace.
Class A airspace is primarily used for high-altitude, long-distance flights. It starts at 18,000 feet above mean sea level and extends up to 60,000 feet. Only instrument flight rules (IFR) flights are allowed in this airspace.
Class B airspace is located around busy airports and is designed to accommodate a large volume of air traffic. It consists of multiple layers and requires strict control measures.
Class C airspace is designated around airports with moderate air traffic. It provides services to both IFR and visual flight rules (VFR) flights.