That is a question that will have many variables involved. Currently there isn't much movement at the top at WJ and their growth isn't very big other than Internationally. Actually every time Swoop gets a jet, WJ looses one. Although WJ pilots are now in the seats. Last talk was 8+ years. But they may get to 6 or so when the old dogs start retiring which given they are all my age...that will be in the next 5 years or so.
As for AC, they are hiring 400+ this year and 400+ next year and mostly due to attrition. I just found out, by a very reliable source that for the first time in AC's history they are opening up the bid for internal guys with no bid loss to the 777 and 787. Whatever they do not fill internally will go to the street. That's right direct right seat 777 and 787 for new hires. Get your resumes in boys. EMB190 and 767 will start to leave this year as well as A220 arrives.