1. Global Market Forecast 2007–2026;Airbus,2007
2. ADV Monthly Traffic Statistics December 2009;ADV,2009
3. Current Market Outlook 2008–2027;Boeing,2008
4. Eurocontrol Long-Term Forecast: Flight Movements 2008–2030;Eurocontrol,2008
5. Conditional logit analysis of qualitative choice behaviour;McFadden,1974