This aerial handout photo provided by the Omaha Airport Authority, taken June 15, 2011, shows flooding around the airport in Omaha, Neb. Extreme weather is a growing threat to the nation's lifelines _ its roads, bridges, railways, airports and transit systems _ leaving states and cities trying to come to terms with a new normal. (AP Photo/Omaha Airport Authority)

Associated Press
This aerial handout photo provided by the Omaha Airport Authority, taken June 15, 2011, shows flooding around the airport in Omaha, Neb. Extreme weather is a growing threat to the nation's lifelines _ its roads, bridges, railways, airports and transit systems _ leaving states and cities trying to come to terms with a new normal.  (AP Photo/Omaha Airport Authority)
This aerial handout photo provided by the Omaha Airport Authority, taken June 15, 2011, shows flooding around the airport in Omaha, Neb. Extreme weather is a growing threat to the nation's lifelines _ its roads, bridges, railways, airports and transit systems _ leaving states and cities trying to come to terms with a new normal. (AP Photo/Omaha Airport Authority)
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