Lockheed Martin C-130J Super Hercules
It can be expected that an aircraft named “Hercules” will be avoided, more so if it is named “Super Hercules.” In 1996, the US Air Force first flew the C-130J. Since then, there have been 15 more countries that have placed orders for the aircraft. This turboprop transport plane has four engines. When it comes to production time, it has outlasted every other military aircraft that has ever been produced. This model may only be roughly two decades old, but the first Hercules flew six decades ago.
Martin JRM Mars
The four-engine seaplane Martin JRM Mars was popular during World War II. It was the largest seaplane that America and other Allied forces used at the time. There were only seven of these planes ever built, even though they were imposing and effective. After the war, four remaining flying boats were transformed into fire-fighting waterbombers, making the planes even more useful. However, those models are not available anymore.