Lighter Haptics
In addition to lower volume from the single speaker, we’ve seen reports that the iPhone Air has gentler haptic feedback compared to the full-thickness iPhone models.
The consensus seems to be that they’re about half as strong. Combined with the lighter weight of the iPhone Air, this means you might have a harder time feeling it vibrate in your pocket when a notification or call comes in.
This may not be as noticeable for things like keyboard haptics, which are already relatively light on most iPhone models to begin with. Reports are mixed on how many people are noticing a significant difference, but the consensus is that the haptics used for alerts and calls are noticeably weaker.
How much this matters will depend on how you carry your iPhone, but it’s worth being aware of.