I have no doubt that this individual was doing what he was told was right. That said, I’m an observant person and seeing this makes me question whether I should be less observant. Honestly. There is no way that Hashem intends us to wrap ourselves in plastic bags when we travel on airplanes.
Aside from causing us to be the object of ridicule amongst the nations to whom we are meant to be light, wrapping yourself tightly in plastic needlessly endangers your own life and also those of others around you, in the event of an air emergency. This itself is against halacha and should remove the plastic as a viable solution to the problem this man was trying to solve.
I am not as learned in our texts as many of the other posters…and while that is nothing to brag about, in this case it gives me enough distance to suggest we step back from the legalistic minutiae to realize what even we moderately learned individuals can see. That a cohen sealing himself in plastic during a flight is a bad idea all around.
P.S. Been on many flights out of NYC with haredeim flying over the many Jewish cemeteries near JFK and never once saw something like this.