The only big issue for me was layover time. If you have an international layover you should allow at least 2 hours between flights. I had one hour and called and insisted that was impossible based on everything I had read. They changed the flight to have a 2 hour layover. I barely made it. For example depending where your connection is, you might have to go through customs and immigration, pick up your bags and then recheck them on the new flight. That is what happened to me. As I was running to the gate which had already closed, they were kind enough to open the gate and let’s us in. Stressful. Make sure you arrive at least a day or 2 early.