300 hours TT may have been the minimum to apply, but I'd be surprised if anyone actually got a job with the majors during that era unless they had several times that amount or unless there were "special circumstances". The market was flooded with ex-military guys from the post-Vietnam drawdown, and my 1979 DAL class averaged over 1500 hours turbine time. In the early/mid 1960s, yes, they were taking guys with only a few hundred hours.