While flying, soda isn't always the best option to sip on. This is because flying at such high altitudes changes the pressure on your body, and soda is heavily carbonated. This combination can make your intestines and stomach swell and cause you to feel uncomfortably bloated or gassy. Not the greatest feeling to experience while sitting amongst strangers in a small space. If you're thirsty, what should you drink then?
Try choosing water or juice when the flight attendants come around to take your drink order on board. Skip the bloating and discomfort, and save the soda for when you land.