The average speed of an airplane depends on the size and type of the airplane. A Boeing 747, which is a popular commercial plane, has a typical cruise speed of .85 Mach or 567 miles per hour when at 35,000 feet.
According to LiveScience, the fastest military aircraft ever flown is the experimental X-15. As of 2013, the X-15 holds the world record for fasted speed achieved by a piloted aircraft: 4,520 miles per hour, which is 6.72 times the speed of sound.
The weight of an airplane depends on its size, type and configuration. The FAA classifies aircraft into six weight classes, the smallest being for airplanes under 12,500 pounds and the largest being for airplanes over 300,000 pounds.