This was just announced in AIR 3.7 not 3.6.
AIR 3.6 includes the ability to package multiple swf's with your iOS app but does not allow you to download them from an external server.
AIR 3.7 looks to give you the ability to load external swf's from a website.
Application developers will be able to host their secondary SWFs on an External server and load them on demand as per their application
logic using this feature. The loading secondary SWFs which have any ABC code in AOT mode, which worked for just locally packaged
SWFs earlier, will now work for loading SWFs externally as well
It looks like the bytecode will be contained in your application binary
During IPA packaging, ADT extracts the Actioscript code from all child SWFs which are specified within the sample text file, adds it to the
final executable and moves the stripped SWFs into the "externalStrippedSwfs" folder created in the current working directory.
Check the release notes PDF for an example,
http://labsdownload.adobe.com/pub/labs/flashruntimes/shared/air3-7_flashplayer11-7_releasenotes.pdf