Spectral Pterrorwing

Vengeful spectres abound in the spirit realm surrounding Dazar'alor.

Riding Requirements:

This mount is available to all eligible characters on your account.
Level 10
Apprentice Riding (ground)
Expert Riding (flying)
Horde only

Source:

Natal'hakata in Zuldazar. Requires Exalted with Zandalari Empire.
Cost: 90000 (reputation discounts apply for some factions)

Notes:

You can purchase this pterrordax mount after reaching Exalted with Zandalari Empire, but you must also have completed the achievement Battle for Azeroth Pathfinder, Part Two. The latter requirement seems odd and may be a long-running error.

Introduced in:

Patch 8.2

Travel Mode:

Ground (+60% or +100% speed)
Flying (+150%, +280% or +310% speed)

Speed depends on your riding skill.

Other Mounts Using the Same Model:

Captured Swampstalker

Kua'fon

Voldunai Dunescraper

More info on Wowhead:

Spectral Pterrorwing taught by Reins of the Spectral Pterrorwing