This aerial handout photo provided by the Omaha Airport Authority, taken June 

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)
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