Here's some suggestions you might try:

1. Command your body to be calm. You control it, it doesn't control you.
2. Pray to God he will give you peace.
3. Have a reserve airplane. It takes the fear of crashing away. This is why you're nervous, you don't want to crash.
4. Go to a health food store and get KAL Liquid Cal-Mag+ it's about $14. Take 1-2 tablespoons 10 min. before you fly.
It is a natural calcium/magnesium supplement, and it calms you down wonderfully well.
Stress (even "fun" stress) depletes your body of it's calcium and magnesium supplies. This will help restore balance.

BTW- Here's some other signs that your body is low on calcium/magnesium:

*sweaty palms
*twitching eyelids/muscles
*white streaks in your fingernails

You can also try B vitamins...they are great stress reducers!

Hope this helps!!
God Bless,
Michael