Was the check book used?
What model and make airplane did he fly?
What is this particular aiplane's mechanical history?
What is this model airplane's mechanical history and statistics?
Was the check book used?
Was there a record of recent checks?
How were the check books spotted in the middle of the ocean?
Was the plane carrying cargo?
Were there any boats reported in the area?
Did he have a current girlfriend or confidante?
Why was he on this particular trip?
Is there a maintenance checklist from the airport in Miami to prove mechanical stability?
Did all the business starting capital come from investors?
Who would have access to a device that received output from a satellite transmission stem?
Did the black box have an underwater tracking device?
Was there a black box?
Is the submarine fee tax deductible?
Get flying records (good performance) as records.
What is the company account history, i.e., last purchases/payments?
Can the bank release company account records to you?
What was stated in the partner's suicide note?
How is the accountant investigating this?
What are his opinions?
How does the "buzz machine" in the tail work?
Is the "buzz machine" sensitive to heat?
Can the checkbook be recovered from the evidence room?
Who was the guy who found the checkbook?
Did the guy who found the checkbook know your father?
Which businesses were patronized lately with his credit card?
1) The investigation into and finding of the responsible party for the plane failure.
2) The investigation into and acquisition of the insurance funds purchased by your father.