Many years ago on a long Trans-Continental flight, an elderly lady asked if she could visit the cockpit. When she got up there, she found four crew.
She asked the first what he did, and he explained that he was the Navigator and his responsibilities were to keep the aircraft on its track across Earth.
She turned to next one and asked what he did. He explained that he was the Flight Engineer and his job was to monitor and troubleshoot any aircraft or engine system problems to keep the aircraft operating smoothly.
She turned to the next one and...
