Yoga can make your flight experience easier.  I'll tell you why and how, using myself as an example.

After you board the plane, there is a long wait before the plane takes off.  You are not allowed to tilt the seatback until then.  I used to feel uncomfortable, until one day I realized that I can do a half-lotus pose.  This pose keeps my upper body straight up.  That a position you can hold for long time and don't feel any stress or tiredness.  When I'm in this pose before take-off, very often I fall into asleep!

Below is a photo of the half-lotus pose.

There is another example.  If you sit in the middle seat, usually you have to bother the one on the isle seat when you go to bathroom.  I always felt guilty that I had to interrupt someone, especially if that person was sleeping.  Now I'm able to get over the person's thighs by raising my foot very high, without asking that person to get up and make room for me.  This move sounds difficult, but when your hips are flexible, you can do it easily.

Practise yoga, and fly easily!