G-5 is a large transport aircraft piloted by Ryu the Owl. Unlike the other Gatchaman vehicles it does not have a civilian disguise and is usually hidden undet the yacht harbor that Ryu is manager at, which Ryu has to dive into every time to dock. It is the most integral piece of the God Phoenix being stationed on the top of the vehicle and serving as command center.
G-5 is hardly ever apart from the God Phoenix and even when separated it lacks weaponry of its own, even after its upgrade. When connected to the God Phoenix, it allows the Bird Missiles to be launched and use the Firebird.