In the 70s there was a really bad made for TV movie that was something like Amityville Horror meets Airport '76. Basically somehow some kind of demon got on a plane and was terrorizing the passengers. You never really saw the demon but at one point it was holed up in the back of a plane behind a curtain. A freezing wind was coming out from where it was. One of the passengers threw a baby doll behind the curtain. Then after a bit the doll popped back out and landed on the floor. It's eyes were bleeding!
Scared the crap out of me as a little kid. Finally they somehow opened the door while the plane was flying, and tricked the demon into leaving the plane. Yep.
I'll be blown away if anyone has any idea what movie I'm talking about. I sure don't.
Edit: I think I've found it.
http://www.imdb.com/title/tt0068715/
http://www.badmovieplanet.com/3bthea...ror37feet.html
Actually it's more like Excorcist meets Airport '76. Wacky.
Also does anyone remember an ongoing series on TV in the mid-70s, where a giant spider (like house size) roams around and continuously terrorizes this family? That always scared me. And what was that movie with an evil robot that looked like a wine opener? The kind where you screw it in, then push down on the handles to pull out the cork.