It went up on an Atlas V rocket because of the Vulcan delays. It was originally meant to fly on the first demonstration flight of Vulcan. (I think that's why it

It went up on an Atlas V rocket because of the Vulcan delays. It was originally meant to fly on the first demonstration flight of Vulcan. (I think that's why it's an oddly undersized payload—only two satellites). https://arstechnica.com/space/2023/08/amazons-first-internet-satellites-will-launch-on-atlas-v-rocket-not-vulcan/ https://arstechnica.com/space/2023/08/amazons-first-internet... https://en.wikipedia.org/wiki/Kuiper_Systems#Test_satellites https://en.wikipedia.org/wiki/Kuiper_Systems#Test_satellites - " The two satellites, likely weighing a few hundred kilograms, are the sole expected payload on the Atlas V rocket that is otherwise capable of deploying 8 metric tons into low-Earth orbit"