Which city is associated with the airport code STL?

The airport code STL is associated with St. Louis, Missouri. Airport codes are typically derived from a city's name and are often based on the first letters or a recognizable abbreviation related to that location. In this case, STL includes the initials of St. Louis, effectively representing the city and its airport.

This convention of using city names is standardized in the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA), ensuring that each airport code is unique and easy to identify for travelers. St. Louis Lambert International Airport holds the STL code, affirming the direct connection between the city and its airport.

Identifying other options shows that Toledo, Ohio, does not share similar letters with the STL code, nor does Tampa / St. Petersburg or Tegucigalpa, as their airport codes differ significantly. This further emphasizes why St. Louis, Missouri, is the correct answer.