I believe Hydro Quebec operates one or more 400s to ferry people to its sites in northern Quebec, and I *think* those are gravel strips of some kind. I'd have thought that a strip capable of taking a 737 must be of a similar standard, so I'd have thought Q400s were a possibility for you. I'm sure a smooth talking man in a suit would try to sell you one, anyway ... then ask engineering whether we could in fact do it or not.