From A Wiki of Ice and Fire
The Blackbird is a ship in service to the Night's Watch at Eastwatch-by-the-Sea. It is the largest of the ships in service with the Night's Watch. Its sails are faded grey.
A Feast for Crows
Captained by Old Tattersalt, the Blackbird carries Samwell Tarly, Dareon, Maester Aemon, and Gilly to Braavos.
A Dance with Dragons
Maester Harmune reports to Lord Commander Jon Snow that the Blackbird and all hands have been lost during Cotter Pyke's expedition to Hardhome.
References and Notes