No AirPlay icon in iTunes or on my iPad/iPhone/iPod touch.
- Make sure that the device has already joined the AirPlay network.
- Before you open iTunes, make sure that you have enabled Bonjour service in your PC. Take Windows XP for example: to enable the service, you can click Start->Settings->Control Panel, and doubleclick Administrative Tools-> Services->Bonjour Service, then click Start followed by OK on the pop-up menu.
- Within iTunes open “Preferences”, Select the “Devices” tab, and activate the following option that says “Allow iTunes control from remote speakers.”
- Close and restart the music app that you are trying to stream audio content from on your iOS device.
- Try restarting iTunes or your iOS device.
- Update the firmware of iTunes or your iOS device.
NOTE: The original iPhone, iPhone 3G, and iPod touch (1st gen) do not support AirPlay.