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Apparently the C-5 was considered for the Shuttle Carrier aircraft, with either a piggyback system, or a strange double fuselage, with the shuttle suspended from a straight wing in the middle.

Twin Fuselage
upload_2017-11-13_10-32-26.png
Piggyback:
upload_2017-11-13_10-35-34.png

How might this effect space development? The shuttle will still be a sorta bad spacecraft, but might this effect other things? The c-5 would have to be owned by the airforce, so it might cause more integration between the two...
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