Does it get heavier while on a plane? Your period will not get heavier during a flight, and the good news is that there is some evidence it may even get lighter. This is due to both the air pressure and the high altitude. One or both of these might then cause a short instances of heavier flow upon landing.
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Traveling across time zones can throw your hormones — and your menstrual cycle — out-of-whack. The further you go, the more likely you are to be affected. This might not matter much if you're visiting Grandma in Norway.
They'll do what they can, then get a cleaner onboard at the next stop, or mark the seat out if service until it can be properly cleaned. It's gross, but no grosser than any other human secretion that can be left on there. There's a kit onboard which is required for hazardous material cleanup, which includes blood.