GRAPEVINE, Texas — The CEO of American Airlines says the once-volatile industry has changed so radically that his company will never lose money again.

Even in a bad year, Doug Parker said, the world’s biggest airline should earn about $3 billion in profit before taxes.

Parker made the declaration at a meeting with analysts and reporters Thursday.

From 1978 through 2013, American’s cumulative profit was $1 billion. By the end of this year, the airline will have earned $19.2 billion in pretax income in the last four years.

Airlines have benefited from lower fuel prices, higher revenue from fees, and less competition because of mergers. American, Delta, United and Southwest control more than 80 percent of the U.S. air-travel market.

“I don’t think we’re ever going to lose money again,” Parker said. “We have an industry that’s going to be profitable in good and bad times.”

Parker admitted it was sometimes difficult to sell that optimism. Many analysts want to see how the airlines fare in a recession. There also is concern that the carriers are growing too rapidly, driving down fares. And if oil prices rise, the airlines would face another spike in fuel expenses.

Airlines are also subject to unforeseen events from terrorist attacks to natural disasters that can hurt the public’s demand to travel. American lowered its third-quarter revenue forecast after Hurricane Irma led the carrier to cancel a large number of flights in Florida.

American on Thursday detailed a plan to increase revenue by $3.9 billion over the next four years through new deals with credit card companies, more seats on planes, and other measures.

Parker also said American has no plans to shrink the space between rows under 30 inches. The airline had planned to crowd some rows on new Boeing 737s 29 inches apart, but changed course after unfavorable publicity and complaints from flight attendants who worried about dealing with cramped and hostile passengers.