Re: Ewww.. SGU let's have some freaking protocol
Tens of Thousands if not millions of years could have passed between Destiny and the city ships. As the ancients looked elsewhere such as into Ascension, Destiny could simple have been forgotten about, lost or destroyed. Given the possible timescales invovled it's really not that suprising that something might have been lost/overlooked/forgotten about etc...
Fine. But that could have been mentioned in the show. One line, say in Serizure. Have McKay say something along the lines of "you know, it's funny. We've been all through the database in Atlantis and there's no mention of this ship at all."
"Internet message boards aren't as funny today as they were ten years ago. I've stopped reading new posts." -The Simpsons 20th anniversary special.