almost $900,000 (roughly equivalent to $ million in dollars) in life insurance policies, including some purchased the day of the crash. The CAB sent the material recovered from Frank's body to the FBI laboratories for testing and analysis. Analysis determined that the many wire fragments that were found embedded in Frank's body, in the seats on the right-hand side, and in the carpeting, were low-carbon steel wire, in diameter. One of the dismembered fingers recovered from the wreckage had been embedded in the face plate of a travel alarm clock. A life jacket from Kure Beach, found with parts of a flight bag embedded in it, tested positive for nitrate residue. A black "crusty" residue on Frank's right hand was found to be manganese dioxide, a substance found in dry cell batteries. In addition to the evidence collected from Frank's body, there were also samples of residue taken from the air vents and hat rack located on the right side of the aircraft near the leading edge of the wing. These samples contained sodium carbonate, sodium nitrate, and mixtures of sodium-sulfur compounds. The Civil Aeronautics Board concluded the severity of Frank's injuries and the numerous particulates found embedded in his body could only be attributed to his proximity to an explosion. Furthermore, the chemical compounds detected in the area around the explosion's point of origin were consistent with those generated by a dynamite explosion. The manganese dioxide samples collected from the seats near the focal point and from Frank's body indicated a dry cell battery was located very near the explosive. The CAB determined, based on the blast pattern, a dynamite charge had been placed underneath the window seat of row 7. The CAB's chief investigator, Oscar Bakke, testified before the Senate Aviation subcommittee to this effect on January 12, 1960. The same day, the FBI formally took over the criminal aspects of the investigation. Other theories One of the first theories considered by investigators was that Flight 2511 was involved in a collision with another airliner, given the crash site's proximity to Wilmington Airport. Investigators reviewed the flight plan and other documents to determine if other aircraft were in the area. There was no record of any other aircraft, or of any military missiles having been fired. Furthermore, wreckage of Flight 2511 was confined to two general locations, namely the primary crash scene near Bolivia and the secondary scene