You can always make a singleton class, something like SeesionFlashVars.as
package
{
public class SeesionFlashVars
{
public static var flashVars:Object;
}
}
Now, in your main class you can write the data in the static variable like this:
SessionFlashVars.flashVars = YOUR_OBJECT;
After that you can access the data same way in any of your classes.