A building with the Caipira Airways logo, most likely a travel agency, can be seen in Ludendorff. This implies the company possibly takes flights to North Yankton too.
Caipira Airways could be possibly based on the Brazilian airline Azul, which has as main destinations Belo Horizonte and Campinas, both places are notorious for rednecks, hence the name Caipira. Azul does not operate internationally though. Caipira Airways also draws some inspiration from the defunct Varig, which was the first Brazilian international airline. The Varig logos and paintjobs looks similar to those of Caipira Airways.
Caipira means Redneck or Yokel in Brazilian Portuguese. This might be a joke referring to the residents of Blaine County. The airline colours are predominantly blue, yellow and green, referencing to the Brazilian flag.