Cycle starts after flying am I the only one?

I noticed that every time I fly, I come on my period. I start cramping while in the air, once the plane lands my period starts 1-2 days later. exp: I came on my period dec 6th and went off dec 10th which is normal. I flew from Phx to Det on Dec 25th had cramps during the flight (s) switched planes. and I came on Dec 27th til Jan 3rd. I noticed this happening before no matter when I have my cycle, if I get in an airplane and fly...I have another one 2-3 days later. Its Jan 13th and I am cramping again. Is this normal?