With all the new hype surrounding native extension support in AIR 3, I haven\'t found a single thing that confirms or denies it is possible to include and use an external JA
You have to combine all your jars into one. Something like http://code.google.com/p/jarjar/ or your own Ant script will help.
Edited to add example: Suppose your main extension jar file is extension.jar and you are using code in external.jar. Then you can put the classes from external.jar into extension.jar using the Java jar tool:
jar -xf external.jar
This will extract the .class files into package folders. If the top-level package is "com", then you can add those to extension.jar with:
jar -uf extension.jar com
(Repeat the second command for each top-level package in the external jar.)
You could also combine the library jars manually by turning them into zip-files (just rename them to .zip) and copy the classes from the 3rd party library into the main one and rename that one back to .jar