Question: Which state-owned entity operates Norway's second-busiest airport, located just south of Grimstadfjorden?
Sentence (from "Brønnøysund Airport, Brønnøy"): It has a 1200 x runway numbered 04–22 and is served by Widerøe, which operates their Bombardier Dash 8 aircraft to Oslo, Trondheim, Bodø, Bergen and other airports in Helgeland.
Relevant evidence: No