World War II veteran Walter Limberger, right, of Ellington, who flew as a B-17 tail gunner, speaks with Barry Sutcliffe, of Smithfield, R.I., who is wearing the flight jacket of his father, George Sutcliffe, who flew P-47 and P-51 fighter aircraft during the war, in front of the Collings Foundation B-17G "Nine O Nine" at Lanmar Aviation at Groton-New London Airport Monday. The three vintage WWII military aircraft, a P-51C Mustang, a B-17G Flying Fortress and a B-24J Liberator, operated by the Stow, Mass.-based foundation will be open for tours 9 a.m. to 5 p.m. today and 9 a.m. to noon Wednesday. Admission is $12 for adults and $6 for children. WWII veterans may tour at no cost. Flight experiences in the B-17 and B-24 are $425 for a 30-minute flight. A 30-minute flight in the P-51 is $2,200.