What does S.A.I.A stand for and what does it mean? I've seen sixteen wheeler trucks with the sign on it. What kind of corporation is that?

Saia, Inc. is a regional less-than-truckload (LTL) companies in the United States with revenue exceeding $976 million annually. They operate nationwide!

Thursday, February 02 2012
Source: http://www.saia.com/v2/AboutContent.aspx?c=cp