It's a no-brainer isn't it? If you need to cut your workforce down to 60% then keep ALL your staff on 60% It's better to have 60% of a (let's face it very good) pilots salary than 0% Keeping as many staff as possible on part time means that when an upturn happens, they're already in place.
DHL have great part time options: 50/57/60/66/75/80/83/92%