MacBook Air can't connect to WiFi; iPhone, iPad can

I'm a pretty experienced Mac and WiFi user, but this one has me stumped.
I was recently waiting for my car to be serviced and tried to connect to the dealer's free WiFi network (Sonic via ATT broadband). My iPhone 4s and my iPad3 had no problem signing-in to Sonic (OK'ing the terms) and accessing the internet, but I could not connect using my MacBook Air (model 4.2). I tried a number of things (e.g., refreshing the DHCP address, turning wifi off/on, etc.) - none worked.
The person at the dealership said, "Macs seem to have a probelm connecting."
FWIW, I have no problem connecting to my home, my work, and other WiFi networks on any of these devices.
Any ideas about why my iPhone and iPad can connect to the Sonic WiFi and my MacBook Air can't?

Hi Anh Tu BUI,
Thanks for using Apple Support Communities. This article has information on troubleshooting Wi-Fi issues for your MacBook Air:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Cheers,
- Ari

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