Turning AirPort off can save your MacBook battery, so its a good idea to turn it off if you are not using it.
Turn AirPort off on Mac OS X Snow Leopard
- Click on Apple menu and select “System Preferences”
- Click on “Network” icon under “Internet and Wireless” section
- Click “Turn AirPort off” button
To turn AirPort On use the same method, this time you will find “Turn AirPort On” button if its Off already.
How to Turn Bluetooth On/Off