Hey! Yeah, I don't recommend using a straw in the first 2 weeks after the surgery. At least for me, the gas was just painful, and I didn't want to do anything to make it worse.....
Airports are, indeed, a hard place to find ANYTHING liquid without chunks of stuff in it. I ended up getting some hot coffee from Starbucks for the plane - warm liquids are much more soothing and satisfying, in my opinion!
One more tip (even if you don't have gas or air built up in your stomach) - take a probiotic or get some drinkable yogurt that has it in it. This helped me TREMENDOUSLY after my surgery. It just helps regulate stomach issues, gas, diahherea (sp?), etc.
Good luck! =D>