Car? Airplane? What's The Difference?

From the Fond Du Lac Reporter:  Larry Schreiber wasn’t flying down Highway 41 when he was pulled over in his Mercedes Benz for drunken driving last summer.
But in an unusual legal twist, it turns out that Schreiber, the president of Anthem Blue Cross and Blue Shield in Wisconsin, ended up being convicted of operating an aircraft while intoxicated for the OWI traffic stop that occurred in Fond du Lac County in June 2011.
That resolution of the case has left state Division of Motor Vehicle officials scratching their heads and local law enforcement officers at odds with the district attorney’s office over the amended charge.
Fond du Lac County Sheriff’s Office Chief Deputy Mark Strand said a shift supervisor at the Sheriff’s Office brought the plea deal to his attention in December. 
http://www.fdlreporter.com/article/20120305/FON0101/303050041/Sheriff-s-Office-DA-odds-over-resolution-drunken-driving-case?odyssey=tab|topnews|text|FRONTPAGE
I realize the Mercedes Benz can be confused for an airplane- maybe at the local school for the blind.
This is just bizarre.