[fullmoon_sulfuras]

I came up with the following function:

function Lunar.Items:BCCIsFlyingMount(mount)
    local items = { "Windrider", "Gryphon", "Cenarion War Hippogryph", "Netherwing Drake", "Nether Ray", "Ashes of Al'ar", "Flying Machine" }
 
    for _,v in pairs(items) do
        if string.find(mount, v) then
            return true
        end
    end
    return false
end

Where mount is the item's name.