The aircraft lessors had to do a pretty significant negotiation with the airports when Flybe 1 fell over. They will also have had to guarantee to a new lessee (Flybe 2) that the aircraft are clear of liens.
You do sometimes get a position where the debt is so big that a lessor will agree with a new operator that a certain aircraft can't be flown into a certain country - I remember some BAE146s years ago which had flightdeck placards saying that the aircraft must not be flown into Italy. I can't see that any of this will be relevant here after the mopping up exercise between airports and lessors which led to the Q400s being released from detention about two years ago. I can't see how they would/will have a problem.