How many B-17s took off from Midway for the first air attack ?
First Shuttle Mission ( Fifteenth Air Force ) 2 June 1944 : 130 B-17s , escorted by 70 P-51 Mustangs , bombed the marshaling yard at Debrecen , Hungary and landed in the USSR , the B-17s at Poltava and Mirgorod and the P-51s at Piriatyn .