Spoiler:
Seeing that the Asuran city-ship departed Asuras and Weir & company had time to come up with a plan and implement it before it reached Atlantis makes me wonder just how fast the city-ship hyperspace drives are. It must have taken hours to pull that reprogramming off for Rodney. For some reason I think the reason the ancients didn't just take Atlantis back to earth is that their hyperdrive engines aren't fast enough to distance themselves from the wraith and thus would have led the wraith directly to Earth and the rest of the MW galaxy.
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