When a photo is imported into Flash, it is in the form of a bitmap. Bitmaps are not very editable. You may use the bitmap tools to edit, but the editing options are limited. Importing an Illustrator file is another story!
All of the layers, paths and individual objects are available and may be manipulated as vector art.
Choose File > Import > Import to Stage or File > Import > Import to Library. Locate the .ai file and you will see the following dialog box.