> From 1990 to 2010 there have been 18 major accidents involving in-flight fire (Flight Safety Foundation) These accidents resulted in 423 fatalities.
> In the late 1990s the rate of diversion in the United States on average was more than one aeroplane each day diverted due to smoke (Shaw, 1999). Fortunately, it is rare for a smoke event to become an uncontrolled in-flight fire. Later data collected by IATA estimates that more than 1,000 in-flight smoke events occur annually, resulting in more than 350 unscheduled or precautionary landings (International Air Trasport Association, 2005). In-flight smoke events are estimated at a rate of one in 5,000 flights while in-flight smoke diversions are estimated to occur on one in 15,000 flights(Halfpenny, 2002)
> In the late 1990s the rate of diversion in the United States on average was more than one aeroplane each day diverted due to smoke (Shaw, 1999). Fortunately, it is rare for a smoke event to become an uncontrolled in-flight fire. Later data collected by IATA estimates that more than 1,000 in-flight smoke events occur annually, resulting in more than 350 unscheduled or precautionary landings (International Air Trasport Association, 2005). In-flight smoke events are estimated at a rate of one in 5,000 flights while in-flight smoke diversions are estimated to occur on one in 15,000 flights(Halfpenny, 2002)
source: http://flightsafety.org/files/RAESSFF.pdf