A:Answer Hello,
Thank you for your interest in the Dell LED S2340 monitor! Since you have a MacBook Air, I recommend purchasing a Mini DisplayPort to DVI cable. Purchase this cable with the desired length you wish to have to connect the Air to the monitor. They usually come in lengths of 3, 6 or more feet. Another route to go is to get a Mini DisplayPort to DVI adapter dongle. These are more flexible but you will also need to connect it up to a standard DVI cable to reach the monitor. Search Best Buy for "Mini DisplayPort" to see options that they sell. You do not need "Apple" brand cables to make it work ;)
Hope this helps!
JonathanNforDell