NEW YORK (Reuters) – Delta Air Lines wants to sell its oil refinery in Trainer, Pennsylvania, after attempts to offer a partial stake in the plant late last year failed, according to two people familiar with the matter. FILE PHOTO – A Delta Air Lines flight is pushed put of its gate at the airport in Salt Lake City, Utah, U.S., January 12, 2018. REUTERS/Mike Blake The Atlanta-based airline hired investment banks last year to organize the sale of a stake in its Monroe Energy refining subsidiary, signaling it wanted to share the risk of running an energy business. The offer failed to attract sufficient interest because a refinery on the East Coast is viewed as an undesirable asset given the rising costs of acquiring crude oil. The airline, the largest in the United States by market capitalization, now wants to sell the entire plant with an eye toward […]