they were dropped from b29 bombers
The atomic bombs were transported by ship to the island the B29's would launch from and were unloaded into a pseudo warehouse to keep them safe.
While the B29 was expensive it cannot even compare to the real most expensive project of World War 2. The Manhattan Project was the most costly project to develop the atom bombs used in World Wa2. This project cost well over 2 Billion Dollars in the 1940s. That would be like a 20 Billion or so dollars today. So the atom bombs each cost slightly under a billion dollars a piece.
the first US delivered atomic bomb was dropped on Hiroshima from a B29 superfortress nicknames the Enola Gay. It was piloted by Capt Paul Tibbets.
The two planes that were used to drop atomic bombs on Japan during World War II were B-29 Superfortresses.
How ? - by using two B29 planes the Enola Gay and Bockscar . First upon the Japanese city of Hiroshima and later upon the city of Nagasaki .
The Enola Gay , a B29 Super Fortress . dropped the "Little Boy" atomic bomb upon the Japanese city Hiroshima . "FatMan" was also dropped by a B29 Super Fortress upon the second Japanese city of Nagasaki . The name of this bomber was Bockscar . See links for further information .
'Enola Gay' a B29 Superfortress. James Doolittle. I'm thinking it was the same aircraft used at both Hiroshima & Nagasaki.....
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boxcar b29
Ohio
According to official records, about 2400 emergency landings were made on the island by B29's and presumably, by their P51 escort fighters.