As noted by 9to5mac last night, AirPlay went missing on the iOS 4.2 GM for iPhone 3G. The feature was there in the previous betas and was working fine, allowing users to stream audio (no video to Apple TV yet, it needs an update) to AirPlay-compatible devices.
Apple apparently removed the feature when releasing the GM build on November 1st:
After speaking to multiple developers and users testing out the iOS 4.2 betas, we have determined that AirPlay did in fact work on the iPhone 3G at one point, meaning the AirPlay functionality was definitely removed from Apple’s two-year-old iPhone at its GM stage. The reason this is an issue is because Apple states, even on their own website, that AirPlay is supported on ALL iOS 4 devices.








