Which of the following city pairs is correctly identified by their airport codes SKB and STL?

The airport code SKB represents the Robert L. Bradshaw International Airport located in St. Kitts, which is part of St. Kitts and Nevis. The code STL corresponds to St. Louis Lambert International Airport in St. Louis, Missouri. Therefore, the city pair associated with these codes accurately reflects the locations of both airports: St. Kitts/Nevis for SKB and St. Louis, Missouri for STL.

In contrast, the other options do not match the codes SKB and STL. For instance, St. Thomas is served by the airport code STT, and Syracuse uses SYR, which do not correspond to the given codes. Toronto's airport codes include YYZ for Toronto Pearson International Airport, while Tegucigalpa is served by TGU, thus not matching SKB or STL. Lastly, Tampa has a different airport code—TPA, and St. Maarten is represented by SXM, again not aligning with the codes in question. Therefore, the city pair of St. Kitts/Nevis and St. Louis, Missouri is the only accurate match.