Delta Air Lines Inc. (NYSE: DAL) wants to investigate the impact of closing its Trainer, Pa., oil refinery, Reuters reported Tuesday in an exclusive.

Delta bought the refinery in 2012 to secure a steady source of discounted jet fuel.

But now the Atlanta-based airline has hired consultant firm Baker & O’Brien Inc. to help it figure out the impact on jet fuel prices if it were to close or sell the refinery.

In a statement to Reuters, Delta said: “Delta has said publicly many times that we are…