We don't have data points to make comparisons. What I think it shows is that once you have the technology and science to successfully build a plane then space i

We don't have data points to make comparisons. What I think it shows is that once you have the technology and science to successfully build a plane then space is actually not a big step. In science and technology things develop in many areas concurrently and at some point stars suddenly align and boom things happen extremely quickly. It's a bit like small drones these days. They require small powerful motors, high energy density batteries, and integrated semiconductors. All those technologies developed independently and then as soon as they all became available, boom, drones everywhere.