Great Lakes left the United Express system in 2001 , although it continued to do codeshare flights until they ceased operations in 2018 .
In 1997 , as United officially designated Los Angeles International Airport one of its hubs , SkyWest Airlines became a United Express partner as well .
Great Lakes left the United Express   system in 2001 , although United continued to do codeshare flights until they ceased operations in 2018 .
In 1997 , as United officially designated Los Angeles International Airport one of its hubs , SkyWest Airlines became a United Express partner as well .