By Susan Carey And Angela Chen 

Delta Air Lines Inc., bowing to pressure from the strong dollar and lower travel demand from oil-dependent economies, on Wednesday said it would cut its overseas capacity by 3% this winter--or a 6% reduction from prior plans.

The biggest year-over-year cuts will come on routes to Japan, Brazil, Africa, India and the Middle East, it said, along with the seasonal suspension of service to Moscow. The company said those moves, which will result in flat capacity overall in the fourth quarter, should help return its unit-revenue performance to growth after several quarters of declines.

Unit revenue, a key metric, is the amount of revenue taken in for each seat flown a mile. Investors, who had been fretting about Delta's bullish growth forecasts and sagging unit revenue, rewarded the company by bidding up its stock 2.6% Wednesday to $44.18.

The Atlanta-based airline announced the trims along with its first-quarter results, which beat analysts' expectations by a penny a share, excluding items. Delta's profit more than tripled to $746 million, or 90 cents a share, from $213 million, or 25 cents a share, a year ago, marking the best first quarter in its history. Revenue rose 5% to $9.4 billion.

But the company also racked up $1.1 billion in fuel hedge losses, including $300 million in early payments on contracts that were supposed to settle later this year. Special items trimmed Delta's adjusted profit to $372 million in the quarter, up from $281 million a year ago.

After an expected $650 million hedge loss in the second quarter, Delta said it believes its hedge losses will be largely behind it by July 1, and its cost of fuel will be 25% lower in the second half of 2015 than it was in the first six months. Delta expects lower fuel costs to save it $2.2 billion this year. American Airlines Group Inc., Delta's largest rival, doesn't hedge its fuel consumption and thus hasn't had to contend with this headache.

The strong dollar shaved off about $105 million in Delta sales during the first quarter, which also was hurt by winter storms. Capacity increased 5% and unit revenue declined 1.7%, mostly on foreign-currency effects. Delta's operating margin was an uncharacteristically modest 8.8%, dinged by three points from the early hedging settlement.

Richard Anderson, Delta's chief executive, said the carrier's domestic business "is performing very well and demand is solid."

Looking ahead, the nation's No. 3 airline by traffic said its second-quarter capacity will rise 3%, and it expects its unit revenue to decline 2% to 4% from a year ago. But it forecasts an operating margin of 16% to 18%, including the additional hedge losses. Delta President Ed Bastian said second-quarter revenue will increase by 2%.

"Our summer revenue performance combined with significantly lower fuel prices and continued strong cost controls should result in another record quarter," he said.

Mr. Anderson said Delta is two notches away from an investment-grade credit rating and hopes a strong performance in 2015 will lift its ratings by year-end. The company is close to completing its five-year plan that will lay out its long-term debt target and level of shareholder returns. Details are expected in mid-May.

Write to Angela Chen at angela.chen@dowjones.com

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