score:7
No, those are the airports that are close to Stockholm. Arlanda (ARN), Bromma (BMA), Skavsta (NYO) and Västerås (VST) are included in the STO airport code. Note though that the time to the airports are quite different when travelling from Stockholm City, from 15 - 20 minutes to Bromma Airport and up to 90 minutes to Västerås Airport.