Development since 2004
Air Botnia was renamed Blue 1 O/Y in January 2004,[9] and joined Star Alliance as its first regional member on 3 November of that same year. The air carrier became a full member of Star Alliance on 1 January 2009 but left it in November 2012 and became an affiliate of Scandinavian Airlines.
In 2005 Blue1 became the second-largest Finnish airline with more than 100 daily flights and the biggest operator between Finland and the Nordic nations Sweden, Denmark and Norway. In 2006 Blue1 started 10 new non-stop routes to Europe increasing its total capacity by more than 50%. In 2008 Blue1 moved its London operations from Stansted to Heathrow Airport, and expanded its domestic business routes. In 2009 new routes to Lapland, including Paris-Kittilä were opened for the winter season and routes to Biarritz, Dubrovnik and Split for summer travel.
Blue1 was the first network airline in Northern Europe to be granted ISO 14001 environmental certificate.[10] On 1 November 2012, Blue1 became a service producer for SAS. This means that marketing and sales were then handled by SAS and its flights carried the SAS flight prefix "SK".
In March 2015, it was announced that Blue1 was to sell their entire fleet of Boeing 717-200s to Volotea and Delta Air Lines and was to replace them with Boeing 737-600s from its parent, Scandinavian Airlines,[11] however Scandinavian Airlines later cancelled the plan and evaluated the transfer some Bombardier CRJ900 from Cimber.[12]
In October 2015, Scandinavian Airlines (SAS) announced the sale of Blue1 to CityJet from Ireland, which was to operate the company on behalf of SAS as part of a larger relationship.[13] Flight operations were halted on 31 October. By December, Blue1 had no more aircraft and its own website was redirected to SAS's website.[14] In 2016, Blue1 was dissolved and assets merged into its new parent CityJet.[15]