Bounce (2000)

Buddy Amaral, a successful and self-absorbed Los Angeles advertising executive, switches airline tickets with a stranger just before boarding a long-delayed flight so that he might enjoy an overnight fling with a pretty Dallas businesswoman. When the plane goes down, killing all aboard, Buddy's guilt soon turns into an alcohol problem. As part of his 12-step program, Buddy seeks atonement and decides to seek out the woman he thinks he's left a widow.