The Cloud People(1991)
A novel by Robert Kelly
The prince and heir to the throne of Fief Karcan investigates the crash of a "flying machine" in the Eastern Mountains, from whence it has been prophesiedthat a savior will come. Though he does not discover the pilot and "savior," the prince learns that his father has been captured by the evil Lord Thyden.
Used availability for Robert Kelly's The Cloud People