No, not aviation routing; IP routing.
From the Terminal 2 American Airlines club, I am unable to hit most *.cloudapp.net IP addresses. This is significant because it's basically all of Microsoft Azure, including logon.microsoft.net, Weather Now, and a bunch of other sites I use or have some responsibility for.
I've just spent a few minutes testing DNS (everything is fine there) and then using tracert and pathping, and it looks like the entire 126.96.36.199/16 and 188.8.131.52/16 ranges are just not visible from here. (The Daily Parker is also in Azure, but its IP is in the 184.108.40.206/16 subnet, which seems to be visible just fine.)
I wonder if Microsoft knows that its U.S. East data center is being blocked by some French ISP? Or why?