I applied online. The process took 1 week. I interviewed at American Express (Phoenix, AZ) in Nov 2013
Interview
The classic American Express interview follows the "STAR" interview format. So they are only looking for Situation, Task, Action, and Result in your response to everything. Upper management does not typically stick to only that format, but first interviews should expect that format.
Interview questions [1]
Question 1
"At American Express, we value (blah blah blah). Tell me about a time when you [communicated a difficult message, demonstrated flexibility to get a task completed, etc..]?