The Bermuda Triangle: Whatever became of the myth

When it comes to planes the methane is less dense than air.  So 1 the Bernoullian lift that keeps the plane aloft is lost cuz of the lack of density.  2 the methane tricks the pilot ibto thibking he is higher than he really is.  So he/she dives and ends up in the ocean. 3 the methane disrupts the oxygen, fuel and spark ratios the engine stalls and gravity brings the plane down.