To enable the "Second Force" to become viable by 1980, its minimum size was to be at least 4 billion long-haul scheduled service seat miles (6.4 billion seat kilometres) per annum by 1975, and its fleet was to consist of at least 14 state-of-the-art long-haul aircraft, including three SSTs, three widebodied trijets and eight conventional narrow-bodied jets.