Vulkan Fighter
From Sonic Retro
The Vulkan Fighter, as it's named by Omochao, is a GUN fighter jet that appears in Radical Highway and in Mission Street's Hard Mode, in Sonic Adventure 2 and that is part of the Fighter series. It looks like a bigger Blue Eagle. It's triggered by Shadow using the lower route through the updraft. As Shadow reaches the end of the updraft section, it will hover down and fire its machine gun. For Tails, it's always there. It awards 500 points when destroyed.