As Delta Air Lines, Inc. DAL prepares to unveil its second-quarter earnings on July 10, the aviation giant finds itself at a critical juncture, facing a potential dip in profits amid a backdrop of strategic investments and shifting market dynamics.Analysts expect the company to report quarterly earnings at $2.03 per share, down from$2.36 per share in the year-ago period. Delta Air Lines projects to report quarterly revenue of $16.18 billion, compared to$16.66 billion a year earlier, according to data from ...