Going Boeing,
Clarrie or Bloggs, do you know when the B717 leases expire?
I could tell you, but then I'd have to kill myself!
Hopefully, they'll expire when I retire in 2025!
Kingswood,
as a high profile Bombardier customer, migration to a future C Series order is certainly plausible.
Using your own words, the only reason that that would happen is to make money, not because "you already run another type of our aircraft".
I just hope that this doesn't become yet another pilot-cat fight over pay, because in the big scheme of things, pilot salaries (or argy bargy small % changes to) don't have much effect on the overall outcome.