4
I believe there are about 65 left in service.
3 u.s bombers disapeared during world war 2
There are many single engine aircraft used as dive bombers and torpedo bombers that could be cited if this were the aim of the question - was it?
1
World wide there are nine towns with the name Halifax. Five of them are in the United States. They are in Massachusetts, North Carolina, Pennsylvania, Vermont and Virginia.
There are only 2 Martin Mars Water Bombers left in the world. Both are based in Port Alberni on Sproat Lake, in British Columbia Canada. One is named Hawaii Mars, the other named Philippine Mars.
That varied depending on the airplane, bombers could have many.
how many miles is it to drive from Vancouver to Halifax
There 3 planes, the Enola gay and two bombers for escorting.
according to wikipedia, 12,731
7,377 Lancaster bombers were built.