From a Tipton County School Employee:

"I just received a bogus email from American Express wanting me to contact them if I didn't make a charge at the Dallas/Ft. Worth Airport.  The email wanted me to contact them, via a web link or call a phone number they provided, if I didn't make the charge.  The email also mentioned that I needed to respond to them to ensure I wasn't held responsible for fraudulent activity.  DO NOT click on any links in any emails you may get that are asking you to verify ANYTHING about you...unless YOU contacted them first and are expecting the email.  If you're concerned about emails you receive along those lines then you need to call the 800 number on the back of your credit card or call your bank."