What is the most common type of fastener used in airplane construction?

In airplane construction, the most common type of fastener used is a rivet. Rivets are particularly suited for joining thin sheets of metal, which is a common aspect of aircraft structures where weight savings and aerodynamics are critical. They provide a permanent joint, which is ideal in aviation because it creates a strong and reliable connection that can withstand the stresses and strains experienced during flight.

Rivets have several advantages, such as being lightweight yet strong, and they can be easily installed without special tools compared to some other fasteners. Additionally, they allow for a streamlined finish on the aircraft's surface, which contributes to reducing drag.

While other types of fasteners like bolts, screws, and nuts play important roles in various applications within aircraft assembly, rivets are particularly dominant in structural applications due to their effectiveness in creating robust joints where reliability and safety are paramount.