Long haul truck driver
2 years of training and 70k later one becomes a "pilot" , unemployed and
even if one is lucky to land an FO job it starts at 18k per year... In 3 weeks and 3k one can get a CDL class A. Truck drivers start at 50k and owner/operators can make 100k per year. You'd need to invest about 8 years in aviation to make 60k. (2 years school, 2 years cfi, 4 years fo)
Just my 2 cents