In the movie World War Z it's established that it takes a person around a minute to turn into a zombie if bitten. (Inferring this from the scene where Brad Pitt chops off the hand of the lady lieutenant and waits for a while to see if she turns, and when she doesn't, he's sure she cant become a zombie.)
In the scene where an air-hostess opens the washroom door in the plane and gets bitten by a zombie locked in the washroom, I was wondering how that scene even added up.
How did this zombie end up on the plane? The guy should have turned to zombie at the airport, in the lines or while boarding or by the time he got onto the plane because it takes a very very short span of time to turn. He couldn't possibly have turned on the plane since he would need someone on the plane to infect him, but he was the only zombie on the plane!
How did this zombie end up on the plane?