Our feeling is that if the pilots are on a pathway to becoming airline pilots, there's such a demand around the world that there's no time to fill these voids and these gaps.
As to why they would be leaving, as Captain Cameron said, usually you don't leave an airline career; it's just that there's no time to get there. They get taken and brought into the business, into the airliner world around the world, because there's so much growth and so much more air traffic.