The menstrual cycle is influenced by travel because of its hormonal relationship to your circadian rhythms. Circadian rhythms are your body's daily cycles. The word circadian comes from the Latin words circa and dias, meaning around and day.
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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. But if you're beach-bound to meet your new lover, cycle unpredictability may be more annoying.
Although some people may notice a change in their menstrual cycle and ovulation during or after a trip, the majority are unaffected. Travel can certainly agitate and manipulate the timing of ovulation, but so can just about anything that causes a lot of stress.
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.