United Continental Holdings reported a $213 million first-quarter net loss

as revenue gains, based on pro forma comparisons, were not enough to offset a $725 million year-over-year increase in fuel expenses. Consolidated yield and passenger revenue per available seat mile increased 13 percent and 10 percent, respectively, on a pro forma year-over-year basis. Claiming a 17 percent year-over-year increase in corporate yields, executive vice president and chief revenue officer Jim Compton during a conference call today said corporate revenue improvement "has been slow but steady. Recovery has been largely driven by yield improvements, with volumes increases not yet materializing."