Alderaan was a personal spacecraft, specifically a space yacht, that belonged to Leia Organa Solo, who held the position of Chief of State, starting in the year 14 ABY.
The spacecraft received its name as a tribute to Leia's destroyed home planet. Organa Solo made frequent use of it following the abduction of her offspring by Hethrir, which necessitated her going undercover. Furthermore, Leia utilized her yacht during the Uprising at Almania that occurred in 17 ABY.