In the release notes for the new air 30 as3.0 it says

App Transport Security

With macOS 10.11, Apple has introduced App Transport Security (ATS) which mandates that applications use secure network connections over HTTPS only. Because this is a significant change, Apple has provided applications an override via NSAllowsArbitraryLoads which will allow insecure connections.

that's crazy if you can't use a raw socket or xml socket, only https, you should go furnace your mac and make some aluminum ingots.