Traditionally, many pilots began their careers at lower-paying regional airlines with the hope of moving to a major carrier, and a bigger salary, in a few years. Most regional carriers used to require 1,500 total flight hours before an aspiring pilot could apply for a job. A portion of those hours -- usually about 500 -- had to be flown in a multiengine airplane; the rest could be in a single-engine aircraft like a small Cessna 172.
In the past, young pilots typically built up their hours by renting airplanes or by working as instructors for flight schools. Many would spend years adding to their flight hours before accumulating enough to apply as a commercial pilot.
Ahhhhh The goood ole days