A pilot can&#x27;t pull over and stop is something goes wrong either. But, yes, we&#x27;re very close to gate to gate autonomous flight. That said, I don&#x27;t expect we&#x27;ll see commercial flights without a captain&#x2F;pilot anytime soon. There are too many reasons to have a human present who has final decision-making authority and that human is a small percentage of operational costs.<p>That also said, Google has a lot of experience driving cars in daylight, in good weather, in a very limited area, and mostly on freeways. That is very different from turning those vehicles loose in Boston, at night, in a snowstorm, without any human even present. Five to eight years to purchase (or rent by the hour) an autonomous robo-taxi is absolute fantasy territory. Personally, I think 20 years is probably very optimistic. (Yes, there are a lot of advances being made but there&#x27;s a huge gap between where we are and where we need to get to replace taxis.)