The final episode, and perhaps, as we see Virdon, Burke and Galen heading off on a raft towards (perhaps) another land in the last frame, this serves as a decent farewell - although the show was cancelled... So for the PLANET OF THE APES television series, there's no actual conclusion.
Pasted Together TV-Movie
Plot centers on a rogue human (slightly resembling Soupy Sales) who created a hang glider - that works, somewhat...
Astronauts Virdon and Burke, knowing a thing or two about flight and a lot about altitude, teach him how to make a better pair of wings - but the inventor gets captured, and must be freed before a lady ape scientist tricks him, and a love-struck Galen, into turning the flying machine into a primitive B1 Bomber...
And all pretty much good stuff, especially the aerial scenes - seeing an ape on a hang-glider is what made our youth dreamlike and cool-weird...
But alas, it's a sad and literal farewell to a creative series, and one of two episodes (beginning with TOMORROW'S TIDE, a personal favorite i.e. "the one with the shark") compiled into a so-called TV-movie mixing this episode in circa 1980, titled FAREWELL TO THE PLANET OF THE APES. But both UP ABOVE THE WORLD SO HIGH and/or FAREWELL has no closure since the series was cancelled after season one. Like so many other great cult shows, it lived on in our imagination. They're out there still. Finding their way...