I've looked for information on this and was unable to find any trace of the footage you mentioned. I'm not saying it's not there or that a more exhaustive search wouldn't find it, but if it is there, it's buried under the mountains of stories about the passengers of Flight 93 fighting back. I did, however, find this video on YouTube, which suggests the plane was shot down:

https://youtu.be/C-5Gks3MFww?si=4daWzrDYVa_CAOYg