FILE - In this April 1, 2011 file photo provided by passenger Christine Ziegler, shows an apparent hole in the cabin on a Southwest Airlines aircraft in Yuma, Ariz. Most travelers don’t think twice ... more 
FILE - In this April 1, 2011 file photo provided by passenger Christine Ziegler, shows an apparent hole in the cabin on a Southwest Airlines aircraft in Yuma, Ariz. Most travelers don’t think twice about the age of their aircraft. But after a five-foot hole opened in the roof of a 15-year-old Southwest jet many fliers are asking: How old is too old? less 
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Associated Press | Photo By Christine Ziegler, file
Fri, Apr 8, 2011 1:14 PM EDT