Ok: "The crew who have..." "The crew that have..." "The crew which have..." "The crew that has..." "The crew which has..." Not ok: "The crew who has..."

Ok: "The crew who have..." "The crew that have..." "The crew which have..." "The crew that has..." "The crew which has..." Not ok: "The crew who has..." The reason that last one isn't ok is that "who" refers to a person or people, not an object. "Crew" can either refer to a singular object or a plural group of people. Put together, "crew who" must refer to a plural group of people, so needs a verb that matches plural.