It was said many years ago when the refinery was bought that it wasn’t just going to benefit Delta but most others also. The main benefit was lowering and smoothing the crack spread which had been out of control. Trainer was to add stability to the jet fuel market. Which it has. It has also allowed Delta to partially eliminate that in our plan. It has done that while turning a profit.
I am a pilot. Not an airline exec. But even I can see that Trainer has been a success.