Board Thread:Administrative Discussions/@comment-1824272-20170723220842/@comment-31542824-20170723230252

Good point about the Arsenal Birds. A more uniting factor between the Hresvelgr, Aigaion and Sphyrna is that they were used as bases (XB-0 less so, considering its short screen time, but given its large size and manned aircraft capacity, plus its influence on the Aigaion, I would still consider it a mobile base). Since the Arsenal Bird doesn't contain a manned force in the same way that the Aigaion does, I think it may be considered to not be a mobile base. Key word being "may", I'm not 100% confident in that if I'm honest, since the similarities are still numerous.

About the Arkbird, perhaps the definition could use some refining to be "a large armed aircraft originally designed to take part in aerial warfare".