I received a call from this number to my Skype number. It was about 3:00 AM in Afghanistan, which means they called at about 18:30 Friday night. I didn't answer and didn't call back
I got a call from this number today. It is from Delta Market Place. I ordered some gift cards but did not receive them. So they called me to tell me what to do next.
This number is the outgoing (Switch) number to American Express Customer Care. You can't call this number back. Generally speaking they will call you back on this number if you have an inquiry in, or there has been a case number assigned to straighten out a problem that you may be having. They generally will leave you with a message and a 1-800 number plus extension to call them back.