NEW ORLEANS - Billions of dollars are on the line when a federal trial opens Monday over the reams of litigation spawned by the nation's worst offshore oil disaster. But those whose losses can't be repaid are hoping for something more elusive: justice for lost loved ones.

Sheryl Revette's husband, Dewey, was among the 11 killed when BP PLC's Macondo well blew out and triggered an explosion on the Deepwater Horizon drilling rig. She wants an apology from the oil giant, something she says she hasn't received yet.

The trial could last the better part of a year. And though it may not bring major revelations about what caused the disaster, the outcome could bring much-needed relief for tens of thousands of people and businesses whose livelihoods were disrupted by the spill.