The Spanish phrase "aerolineas baratas en USA" means "cheap airlines in the USA" in English. This phrase constitutes a search for affordable or cheap airlines in the United States.
"Aerolineas" means airlines in Spanish, and "barato" is an adjective meaning cheap. Here, the adjective appears in a form to agree with the feminine plural noun it modifies, hence "baratas." "En" means in, and "USA" is meant here as an abbreviation for the United States.
A Web search using this Spanish phrase yields multiple results leading to information about cheap airlines and airfares in the U.S. The search results are mostly in Spanish.