This is a useful thread. Can anyone shine a light into this one? It's been nagging at my brain for the last 25 years and my recollect is becoming patchy.
The main character is a cheery lady leaving for a holiday or something, and she's wearing a red polka dot dress. She boards a propellor-driven passenger aircraft, and chats happily with fellow passengers. En route, the plane is struck by lighting and crashes over somewhere remote, like Borneo. All but her and perhaps one other are killed, and most of the film is about her quest to return to civilization. I can only remember one other scene, where she's in the company of another and has been bitten on her back by jungle or swamp-dwelling insects. Her friend helps extract larvae from her back.
As far as I remember, she successfully gets home.
There are many similarities with Seven in Darkness; the look and feel especially, but the details don't seem right.