CHICAGO—American Airlines Group Inc. said on Friday it plans to further trim its summer schedule due to Boeing Co.’s delay in delivering 787 Dreamliner jets. In a regulatory filing, the Texas-based carrier said it now expects to receive only 10 Dreamliner planes this year, not the 13 expected earlier. The remaining jets are now scheduled for delivery next year, it said. As a result, American said it would temporarily suspend routes between Seattle and London, Los Angeles and Sydney, and Dallas and Santiago. The company will also delay the launch of service between Dallas and Tel Aviv, and reduce the frequency of flights between Miami and São Paulo to one a day. In December, the carrier had announced plans to scrap, reduce or delay the introduction of flights to several international destinations, including Hong Kong, saying the delays in deliveries of the 787s had crimped its ability to ramp up …