Due to Spanish legislation, only the pilots based in Spain will get a chance to bid for the ES positions. That fact, however, will not prohibit them(like everyone else employed 1st of march 2020) to bid for all new positions in Norwegian the next five years. Bids to be awarded according MSL.
If one takes a look at the investor relations and company information pages, plan calls for 50 aircraft in 2021, 70 in 2022 and 90 for 2023.
“Near/mid-term transition to MAXs or Neos through fleet replacement and expansion in 2022-2024 is considered feasible within the current fleet strategy”