How to travel on a plane comfortably

I think the best important goods is chewing gum.
Because   chew gum is useful to avoid ear discomfort caused by the altitude change.

I surprised to hear that we must avoid  eating salty food because they can cause us to retain water.
We can spend happy time if we eat some fruits.

I  learnd many things about plane today.
I love plane and airport.

I  want to study more !