Raytheon Aircraft Company in Wichita Kansas... they have already hired for this year, but will probably be interviewing again in October 2007.

I was there from Jan-July 2006 and flew almost 400 hrs in everything from the Garmin Bonanza to the Hawker 850XP... In my opinion it is the best internship out there.

A guy with the username "Kansas" here on the forum was there at the same time I was... I am more than happy to answer any questions, as he probably is also.