Yeah, there was a gal in the parking lot who was very concerned. "They've got to know about that, right?"

But I wouldn't (and didn't) call 911 about it. Nothing actionable by them until it comes down. Not much point calling the airport, either, unless you wanted to make the assumption the radio was out, and that seemed unlikely.

Now, had it actually crashed, I might've called the NTSB in case they wanted testimony. I've yet to see photo/video that shows what I saw -- and they were right overhead.