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Thousands of spectators mingle among inflating hot air balloons at the 40th Albuquerque International Balloon Fiesta in Albuquerque, N.M., on Sunday, Oct. 2, 2011. Fiesta organizers said 550 balloons and 600 pilots from around the world are registered for this year's annual event. (AP Photo/Susan Montoya Bryan)

Amazing hot-air balloons take flight

Hundreds of hot-air balloons will take to the skies this weekend at the 41st Albuquerque International Balloon Fiesta. Take a look back at some of the balloon stars from previous years at the festival.