Just a serious question,
What is a "non cash write down"?
When a company decides an asset is worth less than shown on the balance sheet, it can write down the value of the asset. Causes a non-cash charge. Company didn't spend that money - it just admitted that its assets were overvalued. But it can cause a net loss (like in this case). But unlike fuel or wages, it didn't write anyone a check for this "expense."
In this case, it was Goodwill, that all-purpose imaginary asset. DL and NW added a boatload of it to their balance sheets when they emerged from Ch 11 protection.
Big discussion of it in the 10-Ks for DL and NW.