Commercial radio stations are owned by commercial entities and supported through advertising revenue in order to turn a profit. They operate through the sale of advertising airtime and radio commercials to cover business expenses. Some examples of national commercial radio stations in the UK are Absolute Radio, which plays popular rock music, Classic FM, the first national commercial station broadcasting in 1992, and TalkSport, which has various sports channels. Locally in London, the most popular commercial stations are Magic 105.4, Capital 95.8, Heart 106.2, and LBC 97.3. While NBC owns commercial radio stations and production companies in the US, the largest broadcaster is actually the BBC, which operates nationally and internationally rather than just in America.