SXF is, BRS is in Summer but it reverts to NCL crews in winter. I'm 90% sure in previous years the evening GVA on a Saturday was GVA crews.
There was talk of BFS and BRS being crewed by their based aircraft allowing NCL based planes and crews to fly new routes or increase frequencies. I've not had a look to see yet but from what I gather it's just BRS in summers that are operated by BRS based crews. No sign of BFS yet.
It seems BFS has an extra craft based there from next year, so who knows. I'm sure BFS is a nice littler for the NCL base, so long may it continue to be a NCL based route.