I'm doing Flex development in Flash Builder 4 and I haven't been able to find a way to get it to create a .war file. The project creation wizard lets you select a web server to run your project in so I would expect it to be able to create a .war file. The default behavior is just to copy everything into the project name under Tomcat's webapps/ directory.
Has anyone been able to find a way to create a .war file with Flash Builder 4?