From The Stargate Omnipedia
Ancient transport ship
Ancient vessel capable of carrying at least three hundred passengers. These ships were in use during the first siege of Atlantis. Many were likely destroyed by the Wraith while en route back to the city.
USED BY - Lanteans
FIRST APPEARED - Before I Sleep
Before I Sleep - Dr. Weir listens to the horrifying cries, from the crew of the last Ancient transport ship inbound for the city, when the vessel is destroyed by the Wraith.