The Japanese and U.S. governments have ironed out their report on construction options for replacing a contentious U.S. Marine Corps air base in Okinawa Prefecture, according to sources familiar with the matter.

The report mentions two options for building the facility that will replace Futenma air station: two runways in a V-shaped formation, a plan favored by the United States, and a single runway, the option favored by Japan.

The report contains data indicating the single runway option has an environmental advantage, the sources said. According to the data, the single runway would only destroy 67 hectares of seaweed beds, while the V-shaped runways would ruin 78.1 hectares.