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 and inventor Max Knickerbocker asks Jonathan Knicks. Max is unaware that Jonathan is his grandson, already an adventurous time traveller, thanks to a machine built by his neighbor, Henry Coogan. Can Jonathan save his grandfather from a fatal solo flight across the Atlantic and alter the course of history?