They aren't blocking it - they are doing regional call routing and for some reason this is broken with Skype right now. My own company's HR service center toll free number has the SAME issue - worked a year ago or so and then had the same problems as calling AA, our telco provider said they changed nothing and they assume it's Skype having issues on their end. Just started using Google Hangouts in a web browser and don't see the issue any longer. Shame AA doesn't share a non toll free number - with most calling services free for domestic they may actually save money sharing a routing local number.