Usually a change fee and the difference in price between the old ticket and the new itinerary. If you are a queasy traveler you should consider motion sickness inhibitors such as pills or patches and take them prior to take-off. If you have a growling stomach, get something to eat or bring food onboard. Many flights no longer provide food service and even if they do, you may find that the selection is not to your liking. It is also possible that any service could be delayed by turbulence.
Dehydration is also another frequent pitfall of air travel.
This can cause dry eyes, sore throats and muscle cramps. Drink plenty of water and apply moisturizer to your skin. Avoid alcohol and caffeinated drinks, which increase dehydration. If you prefer more room than the typical coach provides you should request emergency-exit rows. These rows have more legroom and often have fewer seats than other rows.