What is the designation of the Gulfstream 550 cargo aircraft?

The Gulfstream 550 cargo aircraft is designated as the C-37B. This designation is specifically assigned to a variant of the Gulfstream V aircraft used by the United States military for executive transport and cargo missions. The C-37B is utilized primarily for transporting high-ranking officials and is equipped with advanced communication systems suitable for military operations.

The other aircraft mentioned have different roles and purposes. For example, the C-40A is a military variant of the Boeing 737 used for personnel transport and logistics, while the C-130 is a versatile transport aircraft used for a variety of missions, including cargo and airborne operations. The E-2 designates an early warning and control aircraft, known for its reconnaissance capabilities. Each of these models reflects specific operational requirements within the military, further illustrating the unique role that the C-37B fulfills within the fleet.