Korean Air will stop flying the world's longest Boeing 747 passenger flight in 2025, giving the title to Lufthansa come March.EQRoy/ShutterstockKorean Air is expected to stop flying the longest Boeing 747 passenger flight in March 2025.Airlines globally have been phasing out the massive jet in favor of less costly widebodies.Only four airlines are scheduled to operate the jumbo in 2025, representing 75% fewer 747 flights than in 2019.Korean Air is among the last airlines still flying the iconic Boeing 747, but it's scheduled to pull the jet from a particularly long US route in 2025.Route scheduling data from the aviation analytics company Cirium shows Korean Air plans to stop flying the 747 on its 7,153-mile route from Seoul to Atlanta — the longest 747 passenger flight by distance — in March.