Have you ever wondered if you can use more than one external monitor with your shiny new MacBook Air? Well, for starters, it has only one DisplayPort (Thunderbolt that can be daisy chained for multiple thunderbolt devices but they are so expensive as of this writing). USB 3.0 port to the rescue. I used this docking station from iClever ($70+ on Amazon).
Following is a video that shows the docking station in action. I used a 2013 MacBook Air (i7, 8GB RAM and 256 GB SSD). The displays shown in the video are 24 inch Dell monitors.
Make sure you download the drivers from Display Link website before you use your dock. Be warned that depending on your setup, there can be some flicker on the display if you drive your laptop to use maximum resources (opening a lot of applications can easily do this).