I think this might be an example of "good enough" being the enemy of "perfect." Delta still flies DC-9s built in the 1960s, in large part because they're paid

I think this might be an example of "good enough" being the enemy of "perfect." Delta still flies DC-9s built in the 1960s, in large part because they're paid for. Are they as nice as planes built in the past decade? No, but they work fine. On that note, where are the hover cars that Back to the Future promised? I mean, 2015 is just 5 years away...