JetStar (Japan) is a fully owned subsidiary of Qantas Airways, the Australian airline, known as the 4th Reich when it comes to a lot of things, including baggage, with its own Baggage Gestapo enforcing sometimes ludicrous baggage rules with no mercy.
We selected JetStar because they are the only service from Okinawa to Narita. All other airlines, ANA - All Nippon Airways, Japan Airlines, and Peach (with a web site only in Japanese) land at Haneda, which is a nightmare if you want to go to Narita (over 2 hours bus ride) or even downtown Tokyo for that matter.