The primary disadvantage of a turboprop aircraft is its limited speed and altitude compared to jet engines. Turboprops use a gas turbine to drive a propeller, which is highly efficient at lower speeds and altitudes, but as the plane approaches the speed of sound, the propeller blade tips encounter "supersonic drag," causing a dramatic drop in efficiency. This restricts most turboprops to speeds under 450 mph (Mach 0.6) and altitudes below 30,000 feet. At these lower altitudes, turboprops are more susceptible to weather turbulence, leading to a potentially bumpier ride for passengers. Additionally, turboprops are notoriously noisier and cause more vibration inside the cabin due to the physical rotation of the propeller blades. While they are unbeatable for short-haul regional routes and operating on short or unpaved runways, they are fundamentally unsuitable for long-haul, high-speed travel where jet engines (turbofans) offer superior comfort, speed, and the ability to fly above bad weather.