To ward off jet lag when traveling via plane avoid any drink containing caffeine. Caffeine is a known diuretic & the air in an airplane is very drying. So, the combination on a plane can dehydrate you. A major side effect of dehydration is tiredness. So make sure you drink plenty of water. Drinking water will help your body stay hydrated and help your body wash out any toxins & germs you may come in contact while traveling.