Superstitious people have associated the belief that 13 is an unlucky number with the mission, due to the fact that the mission began on April 11, 1970 (4/11/70, digits summing to 13) at 13:13 CST from Complex 39 (three times thirteen), the problems began on April 13, and the mission is called Apollo 13. Other coincidental appearances of the number 13 connected to the mission included the explosion occurring at 19:13 CST, and a post-flight estimate that, had the explosion occurred on the ground, repairing the damage would have cost $13 million. In a feature on the making of the Apollo 13 film, Jim Lovell pointed out that NASA has never had another spacecraft numbered 13. However, in NASA's preliminary schedule for the return to the moon, an upcoming spaceflight is to be called Orion 13.