Leading airline company United Airlines Holdings Inc (NASDAQ:UAL) will report first-quarter financial results after market close Tuesday, April 16. Here's a look at the earnings estimates and key items to watch. Earnings Estimates: Analysts expect United Airlines to report first-quarter revenue of $12.45 billion, according to data from Benzinga Pro. The company reported revenue of $11.429 billion in last year's first quarter. United Airlines has beaten Street estimates for revenue in six straight quarters. Analysts expect the airline company to report a loss of 56 cents per share for the first quarter, compared to a loss of 63 cents per share in the year-ago period. The company has beaten earnings per share estimates from analysts in six straight quarters. Related Link: United Airlines Pilots Urged ...