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I don't fart any more or less on planes, but I am definitely much gassier after a spout of flying.

But I always assumed it was just because I subconsciously held it in more because of close proximity of unfamiliar humans.

The sense of smell is very different at high altitudes (the air pressure in aircraft cabins equals to the air pressure at about 2000m asl.), maybe it’s simply not noticeable.

I do around 6 TATL flights per year and I often notice it although the intensity varies. On short flights on the Eastern seaboard I never seem to have the same problems.

Maybe you were tinking with your phone and didn't notice.