A worker at a Miami investment advisory firm called Income Securities Advisors, which publishes news alerts that get distributed through the Bloomberg News Service, did a Google search on bankruptcies this morning and got back search results that included a six-year-old story published in the South Florida Sun Sentinel about the 2002 bankruptcy filing by United Airlines.
The employee mistook the news for a current story -- despite the date clearly marked on it (see update below) and other information in the article "that would clearly lead a reader to the conclusion that it was related to events in 2002" -- and included it in a subscription newsletter that was distributed through Bloomberg.
Panic ensued, as they say, and United Airlines stock price plummeted 75 percent (down from $12.30 to $3 a share) before someone realized it was an old news story and things righted themselves. The stock rebounded to $10.92 a share by Monday's closing. But not before United Airlines contacted the Sun Sentinel and demanded the newspaper retract its (6-year-old) story.
http://blog.wired.com/27bstroke6/2008/09/six-year-old-st.html