That could be true ICT_SLB, although the Republic orders were for CS300s while Delta purchased CS100s. In theory anyways they would be different slots.
Plus Delta wont take deliveries until 2018 so they actually don't need the earliest slots. Prior to the Delta deal there were less than 50 CS100 orders total. Even if Bombardier had only planned to produce 2 aircraft per month, the entire CS100 backlog would have been exhausted in 2018.