American Airlines Group Inc. said it is further trimming its summer flying schedule due to Boeing Co.’s continuing delays in delivering new 787 Dreamliners.

American, the world’s largest carrier by passenger traffic, is planning to temporarily suspend routes including those between Seattle and London, Los Angeles and Sydney, and Dallas and Santiago, Chile, according to a securities filing Friday. It will also delay the launch of service between Dallas and Tel Aviv, and reduce flight frequencies between Miami and São Paulo,...

American Airlines Group Inc. said it is further trimming its summer flying schedule due to Boeing Co. ’s continuing delays in delivering new 787 Dreamliners.

American, the world’s largest carrier by passenger traffic, is planning to temporarily suspend routes including those between Seattle and London, Los Angeles and Sydney, and Dallas and Santiago, Chile, according to a securities filing Friday. It will also delay the launch of service between Dallas and Tel Aviv, and reduce flight frequencies between Miami and São Paulo, Brazil.

“Further reducing our international flying this summer is a difficult decision, but ultimately, it’s the right one for our team members and customers,” American said.

The Dreamliner delays have hindered American’s plans to restore its international traffic this coming summer. Airlines are hoping that the receding Omicron variant and easing global travel restrictions will mean a rebound in long-haul flying, which has slumped during the pandemic.

A new type of defect on Boeing’s Dreamliner aircraft surfaced recently, the latest in a series of issues that have led to a halt in deliveries. The company now has more than $25 billion of jets in its inventory. WSJ’s Andrew Tangel explains how Boeing got here. Photo: Reuters The Wall Street Journal Interactive Edition

Boeing said it deeply regrets the impact to its customers as it works through a comprehensive process to resume deliveries.

The plane maker has largely halted handing over the wide-body jets to its customers since October 2020 as it addresses a series of manufacturing flaws.

American, which had originally planned to have 13 new Dreamliners for this summer’s schedule, first trimmed its plans in December but had planned on flying passengers with four new 787s that it had expected to receive in the spring.

Now, the Fort Worth, Texas-based carrier is removing those remaining four new Dreamliners from its summer schedule, according to one of the people familiar with the decision.

United Airlines Holdings Inc.

said last month that it doesn’t expect to receive its eight new Dreamliners until after summer. It had previously expected to take deliveries of those planes in the second half of 2021.

American said Friday that Boeing has advised that it will compensate the airline for its inability to deliver the jets. The airline noted that it still has “tremendous confidence in the aircraft.”

Boeing isn’t expected to resume delivering new Dreamliners until the spring or summer, longer than previously anticipated, people familiar with the matter said. The company has declined to estimate when it would resume handing over new 787s, saying U.S. air-safety regulators control the timing.

Earlier this week, the Federal Aviation Administration said it had decided that its inspectors would individually check each Dreamliner once Boeing restarts deliveries, rather than allowing the plane maker to perform the routine work as it had done in the past.

Write to Andrew Tangel at Andrew.Tangel@wsj.com and Alison Sider at alison.sider@wsj.com