XL Airways
 

In collaboration with the French Civil aviation authority and the administrators appointed by the relevant French Court, due to its financial difficulties, XL Airways is deeply sorry to have to announce that XL Airways is suspending its operations effective today, 30th September 2019, at 3.00 pm until, 3rdOctober 2019 included.

https://www.xl.com/en/news-1

There are a number of carriers throughout the world who operate week to week with large amounts of debt in a competitive market. I would expect a few more to fall on their sword in the coming months.