Itunes wireless sync between iPad and Macbook Air
From the Apple support page: iOS: How to transfer or sync content to your computer

Syncing over Wi-Fi requires iTunes 10.5 or later and iOS 5 or later. Also, your computer must be connected to the same Wi-Fi network as your iOS device.


Open iTunes.
To set up Wi-Fi syncing, connect your iOS device to your computer with the included USB cable. 
Click the device button in the upper right corner. (If you are viewing the iTunes Store, click the Library button in the upper right corner. The device button will then be visible.)
In the Summary tab, select "Sync with this [device] over Wi-Fi".





Whenever the computer and the iOS device are on the same network, the iOS device will appear in iTunes, and you can sync it. The iOS device will sync automatically when all of the following are true:


The iOS device is plugged in to power
iTunes is open on the computer
The iOS device and the computer are on the same Wi-Fi network

While the iOS device appears in the upper right corner of iTunes, you can select the content tabs and configure sync options.
Click Apply or Sync to sync the iOS device.