David Freeman has been abducted by aliens and deemed missing by his family for eight years before returning to his childhood home, only to find everything has changed. NASA wants to learn more about his abduction by scanning his brain for information, but instead David is led to a hidden space pod and hops aboard to try to travel back in time to get back to the life he missed while abducted. The pod is guided by a computer named MAX (the voice of Paul Reubens, a.k.a. PeeWee Herman) who takes David on a whirlwind adventure to reclaim some of his lost years.

Screenshot from YouTube
This image from the theatrical trailer for 'Flight of the Navigator' shows David Freeman flying in his space pod across the US.