The practice of meditation, in general, is a great way to ease anxiety, reduce stress, and help you re-focus your thoughts.
One way to reduce anxiety is to write down your thoughts. Journaling is an excellent habit to relieve your mind of your worries.
You can reduce your travel anxiety by planning and preparing as best as you can.
Alcohol can disinhibit you. So any anxious thoughts you have while drinking may manifest in acting out or panicking.
If air travel stresses you out, try listening to calming music on the plane to help you relax.