A:
Hey Ron,
Yes, the Dell Ultrasharp monitor is compatible with a Macbook Air.
The Macbook Air uses a Mini DisplayPort (Thunderbolt) and the Ultrasharp monitor supports DisplayPort, VGA and DVI-D.
Any Mini DisplayPort to DisplayPort, VGA, or DVI-D adapter will work. Any of these adapters will provide you will excellent display quality.
I hope this information is helpful!