There is no way they are considering retirements as part of that number. A net loss in jobs means that as people retire, they will not be replaced. It does not mean that 4000 people current occupied by airlines, not including those retiring, will lose their jobs. In this case, of the nearly 60000 jobs, there will be 4000 less. There will be far more than that in retirements over the next 20 years.