From Smart Money (on your link)

And while I can’t come anywhere close to that Detroit bungalow’s price with a big company, I’m afraid some big companies fetch far less than these at the moment. Phoenix-based Mesa Air Group (MESA: 0.12*, -0.03, -20.43%), with a fleet of more than 150 aircraft and flights to 39 states, sells for less than $5 million, if you want to tackle its more than $500 million in debt.

And you can't argue with that fact!
Mesa is going to die, whether DAL drops them or not.