I am sensing a different approach. A large contract lasting many years in recessionary times is a risk management game. The main contract changes the game in a vital way: neither the contract nor the number of bases force two aircraft per base. So it's about one a/c per base plus spare aircraft dedicated to the contract. The S-92 is proven technology with plenty hours including SAR service. Neither the AW189 nor its competitor, the EC175, have operational hours and only a handful of prototypes exist, so they are unproven. Expect more spare aircraft in Lot 2. If the AW189 has more proven technology in vital aspects of the design: job done.