During 2011, like-for-like revenue from IT Solutions grew by 7.8% 1 compared to 2010, reaching €632.6 million. Contribution also increased significantly during the year, 11.3%, reaching a total of €455.9 million. This represents a contribution margin of 72.6%, a significant increase vs. 68.1% in 2010.
This growth in revenue and contribution is mostly driven by the 17.4% increase in IT transactional revenue, as growth continues in our main business lines. In Altéa, we mainly benefitted from the positive impact of migrations that took place in 2010. The e-Commerce and the Stand Alone IT solutions business areas also performed strongly.
In terms of commercial activity, 2011 was also a very successful year. We continued to add new clients to the Altéa contracted pipeline, with the signing of 11 new contracts in the year, adding further visibility to this business: based on our signed contracts, Amadeus estimates that the number of Passengers Boarded (PB) will be more than 735 million by 2014 2, which represents an increase of over 67% vs. the 439 million PB processed on our Altéa platform during 2011.
Finally, we continued to invest significantly, in preparation for the airline migrations to Altéa in 2012 and the coming years, and in order to reinforce our technology leadership position and our competitive edge: we continue to enhance our product portfolio as well as explore new revenue opportunities in the travel industry.