American Airlines Group Inc. is launching its first scheduled cargo flight since 1984 on Friday, with two round-trip flights over four days between Dallas-Fort Worth International Airport and Frankfurt on a wide-body Boeing Co. 777-300 passenger plane that can carry more than 100,000 pounds of freight. The flights are expected to be booked to capacity and will move cargo including medical supplies, e-commerce packages, and telecommunications equipment and electronics, the airline said. Global carriers including Delta Air Lines Inc., Korean Air Lines Co., and Qantas Airways Ltd. also are running passenger aircraft on freight-only flights in certain lanes. “The business strategies of passenger and cargo should be shifted as the transatlantic road in the sky is now blocked,” Korean Air Chairman Walter Cho said in a statement. “We must flexibly respond to market demand.” Korean Air is among the airlines running passenger aircraft on freight-only flights in certain lanes. […]