Laredo is a border city which is part of the bi-national metropolitan area of Laredo , Texas - Nuevo Laredo , Tamaulipas , Mexico with a total population of 575,585 . The main sources of income for Laredo is international trade , followed by retail sales . Laredo International Airport is within the Laredo city limits , while the Quetzalcoatl International Airport is nearby in Nuevo Laredo in Mexico .