I found something interesting,

http://www.bluegartr.com/threads/126...-14-hour-event

Question 3: Mounts with 3 riders?

Tanaka: I like the variety of mounts. You can get a Draught Chocobo from the friend recruitment campaign and there's also the Ceremony Chocobo exclusive to players who have Eternally Bonded. Will there be any two or three seat mounts that you can fly that you'll be adding in the future?

Yoshida: You want a 3-seat mount?

Tanaka: A 3-seat mount, or maybe a 4-seater!

Yoshida: Since you can ride the Draught Chocobo with friends, we're working on making it a flying mount. It will be set up so flight won't be available if the rider cannot fly.
Looks like its in the works