The Blue Yonder (1985)
Have you ever thought of traveling through time...going forward or backward to any date? That's the intriguing question aviator/inventor Max Knickerbocker (E.T.'s Peter Coyote) asks Jonathan Knicks (Huckleberry Fox of "Terms of Endearment"). Max is unaware that Jonathan is his grandson - already an adventurous time traveler thanks to a machine built by his neighbor, Henry Coogan (Academy Award-winner actor Art Carney). Can Jonathan save his grandfather from a fatal solo flight across the Atlantic and alter the course of history?