70's or 80's movie involving possible virus

Movie made in the 70’s or 80’s. Saw this movie when i was a kid in the 80’s.

Hostages and their armed captives is what i can remember, save the ending which sticks out.
A guy takes a pilot at gun point and gets him to fly him over maybe land or sea. Not sure if it was a small plane or helicopter. The captor opens an envelope or package containing a test tube or similar, to the dismay of the pilot who angrily tells him not to open it. It seems to contain a virus as I understand it now, not when I was a kid.
So the pilot, who knows death is coming, plummets the vehicle to both their deaths to avoid the virus going widespread.

Thanks

The Night They Took Miss Beautiful (1977)?

Thank you chisco. That’s the one. An I now recall a lot more about the movie. Thanks again.

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