I had a similar request to use a shot of mine of a Pan Am 747 a few weeks ago. I checked out wikipedia and also the free use license they use. It is true they are non profit making BUT, from my research there do not seem to be any restrictions on people adding to or taking from all the on line documents wikipedia produce.
Although I do not profess to fully understand all the legal implications I came to the conclusion that once a picture was on wikipedia there was no way of preventing someone taking it and using it elsewhere. As I was being asked to given permission for wikipedia to use the shot on a free license the entire copyright issue seemed to get rather grey to me. In view of this I declined the request although my normal policy is to allow non-profit organizations to use my pictures F.O.C..
My concern is there do not seem to be any boundaries on what can happen to images in wikipedia documents. They came back and asked if I had any low quality images of Pan Am aircraft that I was willing to let them have so, as a compromise, I gave them a small file size copy of a low quality shot that is not in the A.Net DB
. The point being that it is small and fairly low quality so no one is going to be able to use it for serious commercial purposes if the do "lift it" out of the wikipedia document.
My advise is be helpful but do not provide anything you would not be happy to find popping up in other places !
One thorn of experience is worth a whole wilderness of warning.