You are right there's no way there's enough travelers from those back ass countries to influence the worlds largest airline. I've learned the hard way the stock market doesn't always go by facts. The market works on emotions short-term. I hate to say it and haven't been able to do it myself but go with the herd. Travel ban bad = stock down. Today blizzard bad = stock will be down. lol sucks but it right in our faces.
True, that's not the effect it's having though. It's chilling the entire world on travel to the U.S. Nobody from other countries wants to risk visiting on the slight chance they will be illegally detained. Look at all the legal U.S. citizens that have been questioned and/or detained unlawfully. Why risk it?