There are 2 that impress me mainly because of durability, longevity and practicality. The B52 and the C130 hands down in opinion are the best all around aircrafts that meet their respective design parameters.
B-52s fly a hell of a lot higher than 16000 ft (ca. 5 km). The C-141 I flew on flew 41000 ft (ca. 12 km) and it was a cargo plane
Trillions of dollars spent on high tech weapons and we have lost both of the wars too people who didn't have a navy or a big air force, Vietnam and Afghanistan will haunt America for decades to come !!!! 2021
How can you not be impressed by the B52 stratofortress and The Hercules Transport these bad boys were made so well they do not require new replacements just avionic upgrades every 10 or 20 years
The criteria I use is reliability, historical performance, multi-use adaptability, and biggest bang for the buck. So far, my picks are the B-52, and the C-130. The Antonov behemoth has proven to carry incredible payloads, although I imagine the shipping costs are astronomical!