Like I mentioned, reckless driving would be outlawed regardless of written law. It creates the appearance of imminent harm, similar to assault. It's really irrelevant whether the driver is drunk - the pertinent fact is that the driving is reckless.
Similarly, with a pilot, if he's flying recklessly and endangering lives, that's unlawful regardless of written law.
Then, it's also a case for contract law. If you owned a bus company or airline, would you want your drivers or pilots to be drunk? What do you think would happen to them if they were found out?
The last question is, if driving drunk is so dangerous, then why is making it illegal going to stop anybody? If they're really so dangerous, they're putting their own lives on the line. So what is a $200 fine going to do to stop them?
On the other hand, if someone has had one or two beers, still perfectly capable of driving, and is going slowly through backstreets to compensate, why should they be punished? What does anyone gain from punishing that person?
Thanks for your comment.