Spokesmen for Delta and ConocoPhillips declined comment on the reports.
The apparently robust competition among bidders for the ConocoPhillips plant and Sunoco's 335,000-barrel-a-day Philadelphia refinery are positive signals that the plants, which are big employment centers as well as reliable fuel suppliers in the region, will continue to operate. A third refinery, Sunoco's plant in Marcus Hook, has generated no interest from buyers, Sunoco says.
"The action certainly implies that the Trainer refinery will be restarted in the second half of 2012, and perhaps as early as July or August," Kloza wrote.
Kloza also said that Global Partners L.P., a Massachusetts company that owns 800 gas stations in the Northeast along with a network of fuel terminals, has also "expressed interest" in the Trainer refinery. Global owns a terminal in Albany, N.Y., that can receive North Dakota crude oil that arrives by rail and is transferred to barges, which industry analysts believe may be a cheap short-term source of crude for Northeastern refiners.
"People are on the edge of their seats, fingers crossed," said Denis Stephano, president of United Steelworkers Union Local 10-234, which represents more than 250 hourly workers employed by ConocoPhillips before the plant was idled last year. About 22 remain employed as caretakers.
Stephano said that an airline was also interested in buying the Trainer refinery in 1996, when a previous owner, BP, sold the plant to Tosco Corp., which later was absorbed into ConocoPhillips.
But Stephano said that then, and now, there is some skepticism that an airline could operate a refinery. "Hell, some of them can't even run their own airlines," he said.
Delta's interest in buying a business that an experienced oil company wants to jettison has raised eyebrows among some analysts, who believe that the airline has other means available to protect itself from fuel-price fluctuations without investing in manufacturing.
"At one level, it makes sense to better manage supply," said James Balaschak, a principal with Deloitte Consulting L.L.P. in Philadelphia. "On the other hand, it is outside their core business. There are alternative strategies, such a hedging, which can be as effective."
But Michael Linenberg, an airline analyst with Deutsche Bank Securities, characterized Delta's bid in a Friday report to investors as "a very bold move."
Delta spent $11.8 billion on jet fuel in 2011, about 36 percent of its operating expenses, up from 13 percent in 2000. Linenberg said each penny in savings on a gallon of fuel translates into $40 million for Delta's bottom line.
Industry observers expect that Delta would bring in professionals to run the refinery. Kloza and CNBC reported that Delta might team up with J.P. Morgan or another investment bank with experience in trading crude oil. Kloza said Delta has retained two experienced refining executives to "hit the ground running" if its bid is successful.
The Trainer refinery is configured to produce a higher yield of jet fuel - about 13 percent of its output, or 23,000 barrels a day (966,000 gallons). Delta could ship the fuel by pipeline or barge to New York, where it has a large presence at LaGuardia and JFK airports.
Delta would ostensibly receive all of the jet fuel from the facility, but would probably swap much of the gasoline and diesel for jet fuel in other locations near Delta hubs.
"The objective would be to achieve a 10 percent price reduction on a large portion of its fuel needs - which, if were achieved, would represent significant savings," reported Linenberg, the Deutsche Bank analyst.
He said the reported $100 million to $200 million price tag for the refinery was within the airline's budget - equivalent to the cost of two wide-body aircraft.
Sunoco's Philadelphia refinery, which the company says it will shut down by July 1 if it does not have a buyer, also has received some investor interest.
The leading bidder is a subsidiary of Preferred Unlimited Inc., a private Radnor company run by Michael O'Neill that has moved into the business of mining and transporting sand for hydraulic fracturing oil and gas wells. The company has a fleet of 1,500 railcars and has expertise in logistics.
Sunoco has declined to comment on the reports.
Contact Andrew Maykuth at 215-854-2947, firstname.lastname@example.org or follow on Twitter @Maykuth.