I've been near Shimojishima airport on a daytrip to Irabu and Shimoji islands. I took a ferry from Hirara port (Miyakojima) to a port in Irabu (Shirahama I think), about 20 minutes. Irabu and Shimoji are twin islands that are connected by bridge. They are small islands with not a lot of people living on it but it seems that most of the business there is in fishing.
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Photo © Jean
I took a walk in some paths that lead to the two small ponds near the coast left of the airport. I didn't see any aircraft depart or land, although I think I saw a JAL 777 on climbout on the ferry. I might've been a JTA 767 from MMY. I did see some 767s parked out on the ramp. This airport is being used as a training center. There is no current scheduled air service to the airport, although I believe there used to be some flights on Southwest Airlines (Now JTA) or Ryukyu Air Commuter.
Very beautiful place, as was Okinawa and Miyakojima. Hopefully I can go back and maybe do some spotting there. If anyone here is more familiar on this place, I'd like to know where to spot from and how to find out when there will be some flights there if you can.