I'm a former flight attendant. Here are 12 ways I've watched passengers ruin their experience on long-haul flights I used to work as an international flight attendant and have seen many travelers repeat the same mistakes over and over. Tiffany Hawk As a former flight attendant, I've found ways to make traveling less stressful and more enjoyable. Consider avoiding carbonated drinks and gassy foods before and during your flight. Passengers who forget to charge their devices and dress in layers could be in for a rough flight. As a travel writer who used to work as an international flight attendant, I've crisscrossed the globe many times over. I've serviced every cabin and sat in just about every seat on the plane , from a first-class sleeper suite to the dreaded middle spot in the back of economy. In doing so, I've learned many of the tricks of the trade.…