What is the product you are dealing with here? Moving passengers and/or cargo.
Who moves the product? Pilots and cabin crew.
Everything else in the business supports those functions. In descending order they are maintenance, airport staff and last are the worker bees at the head office. They are last and least needed. They should outsourced wherever possible and kept to a minimum head count. This includes HR, training and general office staff. They need to realize that without front line staff they have no job. Their sole function should be "how can I support the people moving the customers?"