What is the term for the second and subsequent sections that extend beyond the back section of an aerial ladder?

The term for the second and subsequent sections that extend beyond the back section of an aerial ladder is "Fly." In aerial ladder design, the fly sections are the movable portions that extend to increase the ladder's reach and height. These fly sections are essential for firefighters and rescue operations, as they allow for access to elevated areas more efficiently compared to just using the base or fixed sections of the ladder.

Understanding the function of the fly sections is crucial since they play a vital role in the overall functionality and performance of an aerial ladder during emergency situations, ensuring that personnel can safely reach higher locations.