Rocket Payload fairings and Aircraft fairings

First of all: What is a payload fairing? a payload fairing is an object on a Rocket or Aircraft, Fairings can disconnect from an object, Payload fairings are used mostly on rockets to protect whatever is inside the fairing through the atmosphere, the atmosphere is mostly made out of Nitrogen gas, which is very cold & if the rocket is going too fast, the rocket will burn as it ascends through the atmosphere. so, a payload fairing can protect a Space Probe through Earth’s atmosphere and after its outside of the atmosphere, it will be disconnected, because it’s no longer needed. After that, the rocket reaches Low Earth Orbit or get into an orbit around the Sun. Payload fairings can be useful for rockets but what about aircrafts? Even though rocket fairings can disconnect, a fairing on an aircraft can also disconnect, but nobody, not even the pilot can disconnect it, why? Because the fairing on an aircraft is used as a structure, not as a fairing.