The company's estimate for 2017 retirements looked like they were using know retirements and adding 15%. That's close to the historical average I tracked years ago. That would indicate perhaps 607 retirements next year.

Using the recent actually retirements with 10% coming from guys averaging 60 yrs old would indicate perhaps 627 reitementes next year. 528 + 10% of 2023's.

Two assumptions = 617 +/- 10.

Hiring nine hundred next year would result in apaprox a two percent increase in manning which is approx the same percentage as the long term expected growth in the industry. So nothing unexpected in those percentages.