I am constantly annoyed whenever I get on a plane and see that row 13 is missing. How does their logic even work? Do they think Death walks down the aisle, going "row 10, row 11, row 12...row 14? Hmm. Well, guess I'm not killing anyone today"?
Believe in superstitions all you want. But if you want to go on the big piece of machinery that uses 100% science to fly you through the air, then shut up and sit in row 13.