Which aircraft is NOT listed as a transport aircraft?

The Lightning is not listed as a transport aircraft because it is primarily known as a fighter aircraft, specifically the English Electric Lightning, which was designed for air defense roles during the Cold War. Its capabilities were focused on intercepting enemy aircraft at high speeds and altitudes, rather than transporting personnel or cargo, which is the primary function of transport aircraft.

In contrast, the Hercules, Atlas, and Voyager are all designed to transport troops, cargo, and supplies. The Hercules is a well-known tactical transport aircraft, the Atlas is used for various logistics and transport missions, and the Voyager serves as a multi-role aerial refueling and transport aircraft. Each of these aircraft fulfills a vital role within the transport category, while the Lightning is strictly a combat aircraft, emphasizing the distinction in their designated functions.