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After an overnight grilling. Jack Graham broke down, signed a statement (which he later repudiated) admitting that he had sneaked his surprise Christmas present into his mother's suitcase. It was no drill for shell jewelry. According to the investigators, Jack's Christmas present was a 14-lb. bundle of dynamite sticks, wired to two blasting caps and a timing device (probably a Westclox traveler's alarm clock) set for explosion in 90 minutes. This week there was speculation in Denver that if one passenger had not been late to his appointment with death, and Flight 629 had departed on schedule, the explosion might easily have occurred over the Wyoming Rockies not far from the place where another United Air Lines plane had crashed three weeks earlier (TIME, Oct. 17), and detection of sabotage would have been a great deal more difficult, if not impossible.