Apparently DL has been in discussions on this for almost a year.
To Chris's question, AA created AA Development Corporation and AA Energy Corporation in 1977, right after the oil embargo. These subsidiaries (merged in 1984 to create AMR Energy Corporation) participated in the exploration and development of oil and natural gas resources. The subsidiary was sold in 1986.
If you look at the graph, there was an uptick in 1977, and it fell off in 1986 (not to rise again until 2001).
Again, I don't know if this is a good move or not.
Certainly, it would have been tried before, and in 1986, Crandall had a lot of smart guys in the room. They saw fit to get out of the business.
As a short term move, this might make sense, but I can't say it is the smartest capital investment. They'd probably be better off taking the money spent on a refinery and taking an ownership stake in an oil company...
Just about everyone else in the airline industry who has made a move at controlling another portion of the supply chain (catering, training, hotels, software) has gotten out.
Even with regional feed, most of the majors have either totally divested or seriously reduced the number of feeders they have control over (AA and AS being the outliers until this week).
Jetblue and Allegiant are also exceptions, in that B6 still own LiveTV and G4 owns its own IT company/division/subsidiary, but we're talking about much smaller investments there which could easily be spun off or even wound down with little impact on earnings.