I'm sitting in one of the terminals at JFK and just witnessed a DL 767 do a touch and go. I watched him land and turned away briefly. When i looked back out the window it was rotating and lifted off. Can anyone confirm if a DL 767 did in fact do a touch and go and if so why? No aircraft have departed from that runway before or after this 767 so i am sure my eyes aren't deceiving me! However there is always the possibility they did. FYI this occurred at approximately 17:09. Thanks!