Delta Air Lines was diverting some flights on polar routes between Detroit and Asia to avoid disruptions to aircraft communications by a strong solar radiation storm, the airline said on Tuesday.
The storm, considered the strongest since 2005, has caused minor disruptions for US airlines, and Delta said it altered routes for "a handful" of flights, and that the changes were adding about 15 minutes to travel times.
"We are undergoing a series of solar bursts in the sky that are impacting the northern side of the world," Delta spokesman Anthony Black said.
"It can impact your ability to communicate," he said. "So, basically, the polar routes are being flown further south than normal."