On 28 December 1948 a DC-3 was lost on a nighttime flight due to unknown causes between San Juan Puerto Rico to Miami Florida. Although the cause and location of the disappearance is Unknown, there are several other factors: The report noted that although the carrier, aircraft, and crew were certified, at the time of takeoff, the aircraft did not meet the requirements of the operating certificate.The company's maintenance records were incomplete. In one case, a subcontractor working on an engine in October 1948 completed the task but did not save any records proving it.As far as human error, the report cited several occurrences:
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