United Airlines Holdings Inc (NASDAQ:UAL) shares left the runway in Tuesday’s after-hours session on the heels of the company’s first-quarter financial results. Here’s a look at the key metrics from the quarter. Q1 Earnings: United Airlines reported first-quarter revenue of $12.539 billion, which beat the consensus estimate of $12.4 billion, according to Benzinga Pro. The company reported an adjusted quarterly loss 15 cents per share, which beat analyst estimates for a loss of 57 cents per share. United said capacity was up 9.1% on a year-over-year basis. TRASM (total revenue per available seat mile) was up 0.6%, while CASM ...