An 82-year-old woman boarded a plane for a four hour flight and arrived at her destination 14 hours later, after she was left on board.
Dolores Runnels suffers from dementia and was meant to fly from Dallas to Houston then onto Greenville in the US.
Instead she arrived on the other side of the country, flying from Dallas to Houston to Greenville to Baltimore to Chicago, finally returning to Greenville.
Her daughter, Melody Allega, was waiting for her mother at the Greenville-Spartanburg International Airport.
She told local news station WYFF4 that Runnel's bag turned up, but not her mother. Allega said she tried to keep calm but none of the Southwest Airline staff could tell her what had happened.