AE CS4 can't import an FLA from Flash, but you can import an SWF. Here's more about AE and Fl integration in CS4:

<http://help.adobe.com/en_US/AfterEffects/9.0/WS609484ED-81FD-41fd-B2C8-10A1D55339EF.html>

<http://help.adobe.com/en_US/AfterEffects/9.0/WSDE67F770-09B6-4f4b-AF9B-9E577311067A.html>

- Jonas Hummelstrand
<http://generalspecialist.com/>