Comparing pilots to doctors is an apples to oranges comparison.

But becoming a pilot requires a fair amount of specialized training (also expensive). Also, quite a bit of tenacity to work one's way up the ladder in this career field. However, I wouldn't compare this to the level of education and training in medical school and residency.

Law School may be a better comparison. Though admissions standards are high (therfore it's tough to get into) the coursework itself isn't particularly difficult if you can study, regurgitate information, and think for yourself. Like aviaton, you can have an undergrad degree in anything, and most people that put forth a 100% effort can handle the classwork itself. While I believe most people can get through law school, much like most people can get their pilot certificates, we really don't have much comparison to the JD that graduated in the top 25% of their class from a top 10 law school...

Just my $.02