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[i]A 2007 analysis of shuttle launch delays by the Associated Press found that the NASA spacecraft launched about 40 percent of the time. The AP analysis found that of the 118 shuttle flights that had flown at the time, 47 lifted off on time. More than half of the delays were caused by technical malfunctions, while foul weather made up about a third of the delays.[/i]
[i]For every one-day scrub when a shuttle mission is called off after its external tank has been loaded with fuel, NASA spends about $1.3 million, said NASA spokeswoman Candrea Thomas. Paying for the wasted liquid hydrogen and liquid oxygen propellants costs about $500,000, and $700,000 goes toward paying personnel, she said.[/i]
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