Yes. Flight is one year to three, so every three years, I gain one year. For shipping, I think it's the same. For operations, probably it depends on what kind of operations, but it's also 100%, so after one year, you gain one year. In case of war, probably it's the same.
So it's different. If your service is not so stressed, probably you gain one year after five years. Sometimes you don't gain anything. It depends on the specialization.