make this paragraph more logical.
Niigata Airport currently has no direct rail access. Regional authorities have conducted studies aimed at potentially extending the Joetsu Shinkansen high-speed rail line or other nearby ordinary rail lines to the airport.
Niigata Airport currently has no direct rail access, although regional authorities have conducted studies aimed at potentially extending the Joetsu Shinkansen high-speed rail line or other nearby ordinary rail lines to the airport.