My guess it that they'll either end up @ FL
(like most 717s that come onto the open market) or perhaps Germanwings will pick them up. The OA
717s are leased (Bavarian and Pembroke, IIRC), so either the lessors will lease them to FL
or Germanwings, or perhaps since they only have a small number of 717s they lease out (They still have unfilled orders for 717s that they haven't even used yet.), they may sell them outright to FL
or another operator.