Started off great, but it meanders aggressively and was unable to maintain the author's or my attention. His claim is that the technology exists for flying cars today, but the political wherewithal for them hasn't kept up. Regulations and environmentalism have gotten in the way. This corresponds well to my priors, but he downplays environmentalism more than I think is deserved; when I dug into his citations they were of poor quality, which unfortunately makes me shift away from the bit of his premise that I agree with. 2/5 due to abandonment.