In some cases, it is possible for jet lag to affect your period. The menstrual cycle is dependent on the body running in 'normal' mode. Changes in your mood that arise from traveling, such as stress or even excitement, can alter the levels of melatonin and cortisol hormones in your body.
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Stock up on tampons and padsMake sure to stock up on your care products ahead of time and take enough to last you the whole trip, plus extra! Also, many brands now sell pocket-sized travel tampons. Check out the click tampons from U by Kotex or Lola's 100% organic compact tampons.
Planes are required to travel with fully stocked first aid kits. If you need a bandaid, sanitizing wipe, or some basic medications, you can ask your flight attendant if they have what you need. Some airlines also offer sanitary pads and tampons as part of their medical supplies, but you can't count on it.
Some airlines may have some sanitary pads onboard for emergency use, but it is best to assume not and pack your own. You may simply also ask the female flight attendant for assistance if you are not prepared.