Several PBS stations also air some CBC programming. However, these programs are syndicated by independent distributors, and are not governed by the PBS "common carriage" policy. Other American broadcast networks sometimes air CBC reports, especially for Canadian events of international significance. For example, in the early hours after the Swissair Flight 111 disaster, CNN aired CBC's live coverage of the event. Also in the late 1990s, CNN Headline News aired a few CBC reports of events that were not significant outside Canada.