Flight speed refers to the rate at which an aircraft or bird moves through the air. It is typically measured in miles per hour (mph) or kilometers per hour (km/h). Factors such as wind conditions, altitude, and the type of aircraft can influence flight speed. For example, commercial airliners like the Boeing 747 can cruise at speeds around 570 mph. Different species of birds also exhibit varying flight speeds. The peregrine falcon, known for its incredible diving speed, can reach over 240 mph during a hunt. In contrast, the average flying speed of a hummingbird is about 30 mph. Understanding flight speed is essential for aviation safety and wildlife studies.