I like classical, but that was a poor choice of piece for that setting. It's one that isn't to many peoples' taste.
I have a few other questions we may never get answers too. Most musicians I know would have detuned their instrument before flying, because otherwise the pressure changes can damage a violin. That piece was played in tune (playing out of tune would have been really unforgivable). So, how much time did they spend tuning? And while I like the sound of strings being played, tuning is not generally a joyful noise. So, it wasn't 6 minutes unless each of those musicians had their instruments tuned before they started.
I also think that in general a captive audience is rude. If you're doing something unexpected in a place where people can not leave, it's on you to make sure you aren't irritating people. If you keep it brief, and are sensitive to people who react to it, I think a short performance is okay, but still not the best idea. If you poll people, then it gets better, because you lessen the likelihood that someone will want to shove a knitting needle into their ear to get away from the sound.