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The Lockheed C-5 Galaxy has been a workhorse of the US military since it was introduced in 1970. It's absolutely enormous, with a payload of 270,000 pounds. It's big enough to swallow the fuselage of a C-130

Lockheed considered making an airline version known as the L-500
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They said an all passenger version could carry 1000 people (I don't know if that means no space for cargo which makes it a very meaningless superlative). The company decided against it as Boeing's 747 struggled in the marketplace. This along with cuts to military spending with the drawdown of the Vietnam war and troubles with the L-1011 airliner brought Lockheed to the brink of bankruptcy and forced a government bailout in 1971. So what if Lockheed hat bit the bullet and made an airliner out of this giant cargo plane? With more passenger capacity than a 747, it could've outsold Boeing and perhaps allow the company to remain in the commercial aviation market.
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