A security helicopter fly past the vehicle assembly building at the Kennedy Space Center before the scheduled launch of space shuttle Endeavour at Cape Canaveral, Fla., on Friday, April 29, 2011. NASA... more 
A security helicopter fly past the vehicle assembly building at the Kennedy Space Center before the scheduled launch of space shuttle Endeavour at Cape Canaveral, Fla., on Friday, April 29, 2011. NASA scrubbed the scheduled launch for technical problems. less 
1 / 1
Associated Press | Photo By J. David Ake
Fri, Apr 29, 2011 12:47 PM EDT