Here is information from ConocoPhillips website about the Trainer refinery which apparently works in conjunction with the Bayway refinery which it sounds like has more flexibility to produce different types of products... thus it is possible that the Trainer facility is less valuable - and thus could be surplussed more easily.
http://www.conocophillips.com/EN/about/worldwide_ops/country/north_america/pages/east.aspx
According to C-P, the refinery produces more gasoline than jet fuel so it is indeed not predominantly a jet fuel facility.... but since no refinery can exclusively produce one product, it is a given that DL would be getting into the petroleum business - and doing so has to be weighed against the benefits they would gain from what matters to DL, even if they might make some money on other petroleum products.
C-P also indicates the refinery is connected to the US petroleum distribution system via pipelines, barges, etc.
And it is likely that DL would not say "this jet fuel came from our plant" but that whatever is produced is dumped into the whole distribution system and DL then turns around and buys what it needs, being given credit for what the refinery produces.
The refinery was shut down Jan 31, one of two Pennsylvania area refineries that were shut down. C-P cited imports and environmental issues as some of the reasons.
http://articles.philly.com/2012-03-28/news/31250006_1_refinery-conocophillips-buyer
According to statistics from C-P and the US DOT, the Trainer refinery is capable of producing about 5% of the jet fuel burned by US airlines worldwide...
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Bayway Refinery
The Bayway refinery, located on New York Harbor in Linden, N.J., has a crude oil processing capacity of 238 MBD and processes mainly light, low-sulfur crude oil. Crude oil is supplied to the refinery by tanker, primarily from the North Sea, Canada and West Africa. The facility distributes its refined products to East Coast customers through pipelines, barges, railcars and trucks.
The refinery produces a high percentage of transportation fuels, such as gasoline, diesel fuel and jet fuel. Other products include petrochemical feedstocks, home heating oil and residual fuel oil. The mix of products produced changes to meet seasonal demand. Gasoline is in higher demand during the summer, while in winter the refinery optimizes operations to increase heating oil production. The complex also includes a 775-million-pound-peryear polypropylene plant.
Trainer Refinery
The Trainer refinery is located on the Delaware River in Trainer, Pa., about 10 miles southwest of the Philadelphia airport. The refinery has a crude oil processing capacity of 185 MBD and processes mainly light, low-sulfur crude oil. The Bayway and Trainer refineries are operated in coordination with each other by sharing crude oil cargoes and moving feedstocks between the facilities. Trainer receives crude oil from West Africa and Canada.
The refinery produces a high percentage of transportation fuels, such as gasoline, diesel fuel and jet fuel. Other products include home heating oil, residual fuel oil and liquefied petroleum gas. Refined products primarily are distributed to customers in Pennsylvania, New York and New Jersey via pipeline, barge, railcar and truck, and home heating oil is distributed by tanker.