How to set the icons for an AIR application in Flex?

Open [ApplicationName]-app.xml file and add the following.

< icon>
< image16x16> yourIcon16.png</image16x16>
< image32x32> yourIcon32.png</image32x32>
< image48x48> yourIcon48.png</image48x48>
< image128x128> yourIcon128.png</image128x128>
</icon>

Icons will be included/updated once you build the .air package.