Because:
1. Airways isn't paying leases on them. If they park PSA -700's they're bleeding cash due to having to pay leases and not making revenue.
2. MAG hasn't infused Airways with cash like Republic has, which was smart of BB to pretty much keep them safe in a situation like this.
3. MAG is on the way out at Airways anyways.
4. You must work for MAG. I was management at MAG and MAG is by no means efficient! But you are correct about them being cheap!