Depending on the size of the jet, the amount of engines may vary between 2 and 4 (on most commercial aircraft)
The engines can be fixed to the wings, integrated in the tail, or above the...
The average US jet production was well under 3,000 jets, only 833 F-105 Thunderchiefs were produced (of which nearly 400 were lost in the war), while the F-100 Super Sabre (over 240 lost in the war)...