I am AMAZED to see that NO ONE has mentioned the North American P-51D Mustang as sexiest plane!!! But, with me, it's a tie between it and the Chance Vought F4U Corsair (any variant). Two of the best-looking aircraft ever designed. Also, the F-4E Phantom II...............
Oh, and the Grumman F7F TigerCat........
Oops, I almost forgot the Douglas A-4 Skyhawk.......
MAN, this is TOO hard for me to do!!!!!!!!!! There's just TOO many I like!!
By the way, the Vigilante was made by North American and was designated the A-5 and the RA-5C. I think that it was originally designated the A3J (but don't quote me on that) before McNamara decided to revamp the military in the early 1960's.