There is a well known frum website Jew in the City, Its run by a MO Baal Teshuva with quite a following
Before Erev Rosh Hashanah there was a story about this occuring on an El Al flight, Allison Josephs who runs the sight assumed the story was a hit job on religious jews and asked her readers if any of them had been on that flight. One reader who was not on that flight but was on one 2 days before said he had seen a similar incident and the Pilot had to go on the PA system and tell people if they did not sit down they would lose their takeoff spot at JFK and could not leave.
I also heard a Rabbi giving a shiur and he recalled a simialr incident on his flight