DY: I’m saying that. The bag is irrelevant and nonsensical. Reread my last post.
Yytz: Bitul has nothing to do with this, and Tumah is Tumah. I know Rav Schachter quotes a random T’shuvah that above the clouds is Muttar because Tumah only goes until the Rakia, and not above. But no one (not even Rav Schachter) actually holds like that.
Just to be clear, there are ways and reasons to be Meikil by an airplane (especially over a non-Jewish cemetery). This plastic bag cannot be one of them.