ahriman doesnt fly in hw...why?

[Gunspec]

they will probally just add some effect so they all "fly" just think ahriman should of been able to fly alongside fat chocobo not much further down the track when they patch it so anything can "fly"

Making the Ahriman and Bomb Palanquin fly might require tweaking the animation to make the flight look good, especially when moving up or down. They didn't get around to tweaking those animations in 3.0, because they were busy designing a variety of new mounts, so they planned to do that tweaking for 3.1.

Of course, that doesn't explain why the Gilded Magitek Armor can't shoot and the Cavalry Elbst can't spit water (like in the moonfaire 2014 event), since those animations are already in game for those specific models.