BARKSDALE AFB LA — A B-17G and a B-52H fly in a heritage flight formation during an airshow practice at Barksdale AFB LA. These two aircraft represent 70 years of Fortresses and the first time in 50 years that the two aircraft have flown together in a formation flight.The formation will thrill spectators attending the 2-day 2006 Defenders of Liberty Airshow held 13-14 May. (USAF Photo by Master Sgt Michael A. Kaplan) (Released)