Code:
creatureDisplayInfoID, description, source, isSelfMount, mountTypeID,
uiModelSceneID, animID, spellVisualKitID, disablePlayerMountPreview
= C_MountJournal.GetMountInfoExtraByID(mountID)
= C_MountJournal.GetDisplayedMountInfoExtra(index)
https://wowpedia.fandom.com/wiki/API...tInfoExtraByID
One of the returns is the mountTypeId with for flying should be 248 for most flying mounts.