They can, and they do, but I think maybe there's a problem with it nevertheless. A few days ago, at DFW, I had an e-ticket (issued in MAD) reprinted, but what I got is *different* from the actual receipt originally sent to my address in MAD. Whereas the receipt shows an actual ticket number, and all of the itinerary is printed on just one page, the 'copy', printed by DFW, is merely an itinerary, similar to the one you get from aa.com, and simply prints on ticket-like stock, so in the end I received 5 pages, none of them showing a ticket number, just a simple itinerary with flight details.

Maybe the agent gave me the wrong doc? maybe I should have insisted on a copy of the *receipt*? I feel reasonably safe with this 'itinerary', but I'd feel better with a copy of the original receipt, ticket number included, as per number_6's comments.