This may be a long shot. I am trying to find the title of a movie that near the end of the movie two kids (possibly teenagers) come across a spaceship and find out they are aliens and are able to operate the spaceship. I originally watched it on tv and it was in color.
Thanks
Escape to Witch Mountain?
http://www.imdb.com/title/tt0072951/
explorers? 2 boys build a spaceship and towards the end aliens give them the ability to fly it