They were in the playoffs every year from 1991-2005, and 2010.
The Atlanta Braves franchise has appeared in 9 World Series, and won three World Series titles in three different cities.
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Since 2000 the Chiefs have made the playoffs 2 times. During the 2003 and 2006 season.
The Cowboys have appeared in the playoffs 30 times between 1966 and 2009.
Twice. They defeated Tampa Bay in 2005 but then lost to Seattle, and they lost to Seattle in 2007.
The Cowboys appeared in the playoffs after the 2003, 2006, 2007 and 2009 regular seasons.
In the ABA, they made it to the playoffs 7 times. In the NBA, they made it to the playoffs 16 times.
The Boston Red Sox have been in the playoffs 20 times since 1901(when baseball started having leagues and championships).
They have gone to the playoffs six times, with five wins entering 2010.
The Dallas Cowboys have appeared in the playoffs 30 times between 1966 and 2009.
Through the 2012 season, the San Diego Chargers made the playoffs 17 times.
They have made the playoffs 25 times with a record of 17-18.