What is the origin of the idiom "in the loop" and when to use it?

The idiom "in the loop" originated from the world of aviation. In aviation, pilots flying in a loop formation had to maintain precise coordination to avoid collisions or accidents. Being "in the loop" meant being part of this coordinated group, aware of the flight plan and communication among the pilots. This phrase is used to describe someone who is informed, involved, or included in a particular group or project where important decisions and information are shared. It implies that the person is well-connected and has access to valuable information. It is often used in professional and business contexts.