I don't have a link, but can relate a story told to me by my father. He's a retired Air Force pilot, so take it for what it's worth to you.
He was on a training mission in a T-33. His IP simulated an engine failure over Carswell AFB, TX (now NAS Ft. Worth/Carswell Field). The IP wanted to see him spiral down to a simulated dead stick landing at Carswell. Instead, my father pointed the nose toward the home field (Waco?), well to the south. His IP yelled at him wanting to know what he was doing.
My father's response was if everything the instructors taught in ground school was accurate, the airplane's home base was well within glide range and said the home field, with appropriate maintenance for that airplane was more suitable than Carswell. The IP let him try it and it worked.
My father's experience of suitable vs. usable is the best illustration I know of.
Fly safe!
