If buying the refinery has been such a windfall, why hasn't anyone followed suit? It's not like finding one for sale is hard.
I haven't shopped for refineries, so I can't speak on the issue of whether or not they're easy to find on sale.
There were a number of jet fuel supply issues on the east coast that were causing east coast jet fuel prices to be higher than most of the rest of the US.
Starting with refinery production, refineries produce a number of different fuels to optimize profit. Refineries' percentage of Jet fuel production vs gasoline/diesel/heating oil/etc has been causing a shortage of jet fuel, driving up prices. And since most jet fuel consumed on the east coast was produced in the gulf coast, there were transport costs and pipeline limitations (supply constraints) that also raised costs.
Another reason for jet fuel prices to rise on the east coast, and was part of the reason why east coast refineries were being shut down is that the Amsterdam/Rotterdam/Antwerp (ARA) refineries, optimizing their refineries, were overproducing gasoline for Europe. This is because there's been a shift toward diesel vehicles in Europe, decreasing the need for gasoline. A lot of the excess refined gasoline has been exported to the east coast of the US. I'd dig up links to show the numbers, but this one should satisfy anyone scratching their cranium case about gasoline exports/imports:
http://blog.pjk-international.com/?type=91&PaginaID=616&CatID=327&SubID=317&Letter=1&ADID=119
At this point, I'd like to make sure that everyone understands that Delta's refinery purchase was/is a hedge on the
crack spread, not on jet fuel prices. Delta still needs to buy oil and refine it so it doesn't lower their cost of purchasing oil.
That said, one thing that Delta did which is IMHO brilliant is that they've tweaked the refinery to produce a higher percentage of jet fuel than other refined products. Delta swaps a lot of the other refined products for jet fuel.
Because of the increased supply of jet fuel on the east coast due to Delta's refinery, it has driven down the east coast cost of jet fuel for all airlines. I'm sure it wasn't their intention, but since they are probably the largest consumer of jet fuel on the east coast, Delta benefits the most from the refinery.