Doctors may make that kind of money, but remember their salaries are largely based on great insurance plans of their customers. If doctors had to directly charge their patients, they wouldn't earn more than $50,000 a year.
In contrast, this is a business that directly competes for money paid out of the customers pocket. The average business fare in $467 and the average out of pocket fare is $108. If every passenger was a business fare, we would be making way more than any doctor.