I can't help but laugh at the notion that Cohanim shouldn't fly in a plane due to the chance that it might pass over a cemetery. Even funnier is the notion that this prohibition should only apply to a particular plane-- as if only one particular plane might have such a flight route. This sounds like it comes out of the stories of Chelm.
One dead, three injured in Northern Arizona University shooting (DPA)
from the article: Ultra-Orthodox passengers riot aboard El Al plane over screening of film