They don't really seem to have much in common (apart from humungous lateness and unbelievable overbudgetness)
...and
common reasons for the above.
Namely, specifications that push the state of the art, forcing great technical risk-taking; diverse technical and industrial requirements by multiple customers; ... I'm sure we can identify more common drivers for the cost and delay.
If mods wish to split the two, fine; but at least consider what the two have in common.