When I visited family in Alberta, I checked Southwest out of habit, but they don’t fly to Edmonton. I realized it after trying to shift my dates and saw no Canadian airports available. What I do love, though, is how easy Southwest makes quick booking changes—seriously, I’ve canceled and rebooked in minutes during price drops. For the Edmonton trip, I used another airline, but I still used Southwest for the connecting U.S. flights because modifying schedules through their site is the simplest thing ever. No stress, no extra fees, and instant flight swaps.