Sci Fi Movie From my Past. Can't remember name?

I checked out the trailer on youtube but the bulk of the movie doesn't look like what I was thinking of.

I wish I could see the ending! I wonder if I watched this one too and now I'm just mashing them together in my brain!

EDIT: I found that movie online for streaming and skipped to the ending. I was convinced that was going to be it when I saw that ending and they shot the side view of the helicopter. In the movie I'm thinking of, I remember the monster jumping up from the ground and grabbing the landing rails. That actor looked familiar though. I wonder what else I've seen him in.

EDIT: Peter Fonda... He's been in a ton of stuff!

I did see the ending by googling the title...

Just messaged you too but I'll post here... I just got to the movie right before you sent this. Thanks a lot!