Ask them nicely to move it, as it's blocking your screen.
What you do next depends on their response.
I would tell them and move it if they didn’t.
@georgetakei
Back in the good old days, when smoking was allowed on airplanes, I'd light that fake fur on fire.
OK, not really. I'm just reminding y'all that we used to be insane enough to allow smoking on commercial airline flights.
I would just deal with it.
By waiting until the cabin lights dimmed and then slowly and quietly garrotting them with the sleeves of their jacket.
@georgetakei
I am the sort who likes to follow one faux pas with another.
Upon landing kind passenger would discover a hood full of the nastiest things I had mined from my nostrils through the duration of the flight.
I’ve learned over the course of my life that few to no people have sympathy for the thoughtless sort in public and will generally sit in silence as you giddily sabotage said individual
"Hey, friend, your coat's blockin' my screen." Say it with a smile and you tend to get the results you want.
I would remain politely quiet and remove the coat with scissors.