American Airlines Group Inc. expects to gain more sway over ticket prices this quarter, giving hope to an anxious industry that fares are stabilizing and will keep improving. Passenger revenue for each seat flown a mile should rise 2.5 percent to 4.5 percent from a year earlier as business and leisure travel increase, the world’s largest carrier said in an earnings statement Thursday. The benchmark figure, known as unit revenue, has climbed for four straight periods at American, even after hurricanes forced the cancellation of 8,000 flights in the third quarter.  “The outlook calls for an improving revenue environment,” Helane Becker, a Cowen & Co. analyst, said in a note. “Management has consistently said they expect sequential improvement in unit revenue from 3Q17, while investors were skeptical.” Coming after a similar forecast from Delta Air Lines Inc., American’s outlook should help quell industry anxiety about a fare war that erupted earlier this year. United Continental Holdings Inc. caused concern this month when it said the battle had expanded to more markets and driven down some so-called walk-up fares around the industry. Such tickets usually are purchased for business travel and typically are among the most expensive. American climbed 3.7 percent to $52.88 at 9:37 a.m. in New York. The shares gained 9.3 percent this year through Wednesday, while a Standard & Poor’s index of airline stocks advanced 2.1 percent. An unexpected increase in average fare per mile helped offset $75 million in reduced earnings from three hurricanes that slowed travel in Texas, Florida and the Caribbean, the Fort Worth, Texas-based airline said earlier this month. That was the first time that the measurement, known as yield, had improved since the start of summer and boded well for prices toward year end. Yield grew in every region last quarter for the first time since 2014, the airline said. Basic Economy American’s expansion of its basic-economy product throughout the continental U.S. last quarter allows the carrier to compete with ultra-discounters like Spirit Airlines Inc. on fewer seats than before. Basic economy offers a lower fare with no upgrades, no advance seat assignment and one carry-on bag that fits under the seat. About 50 percent of travelers considering basic economy end up buying a higher-priced ticket, American says. Capacity will increase 1 percent this year, with the number of seats and flights unchanged domestically and rising 4 percent for international service, American said. Pretax profit margin, excluding some items, will be 4.5 percent to 6.5 percent this quarter. Costs for each seat flown a mile, excluding fuel and special items, will increase 4.5 percent this quarter and 5.5 percent for the full year. Third-quarter adjusted earnings fell to $1.42 a share. Analysts had predicted $1.40, according to the average of estimates compiled by Bloomberg. Revenue rose 2.7 percent to $10.9 billion, matching analysts’ expectations. Unit revenue increased 1.1 percent from a year earlier. The National Association for the Advancement of Colored People on Tuesday issued a travel advisory against American, saying a series of incidents involving African-American passengers “suggest a corporate culture of racial insensitivity and possible racial bias.” American Chief Executive Officer Doug Parker said the carrier doesn’t tolerate discrimination and will invite the civil-rights group to discuss the issue.