TYB
The southern aircraft is a P-8. The one about to land at Okinawa is an air tanker. The flight track of that one would seem to indicate that he was refueling something out of range and visibility on the network. Probably something headed for Taiwan that wants to stay out of view, for now,
https://www.flightradar24.com/multiview/3db3b87c,3db410fa
This flight track on the tanker shows just how much better FR24's coverage is compared to ADSBx.