This may be pretty known thing, but I would like to share it. When creating a new AIR project in flash builder (File / New / Flex Project / … Desktop – AIR), and you do not require flex framework, just rename the “Main application file” to whatever.as (instead of whatever.mxml) in the last step of creation wizard (screenshot attached). Or, if your project already exists with main app.mxml file, just create new file with the same name app.as and remove the old one (app.mxml). Make sure your main application class extends Sprite.
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