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With regard to reserving FBI planes, the lawmakers want to know: "How many times has a request for FBI aviation support been unfulfilled because personnel and/or equipment were not available?" and "How many investigative operations had unfulfilled aviation requests regardless of reason?"
The lawmakers are also seeking details of claims that Holder failed to notify the FBI in a timely manner when he decided to change his travel plans.
"If these allegations are true, describe in detail each such instance where the FBI had to lease an additional plane due to Justice Department executive travel," the letter requests.
The lawmakers are also interested in the cost of personal travel by DOJ officials.
"Does the Attorney General reimburse the taxpayer for personal travel expenses when he uses FBI aircraft, like Secretary Panetta does with the DOD?" the letter asks. "If so, at what rate does he reimburse the taxpayer and how does that rate compare with the actual costs of using the aircraft? How much was reimbursed total in each fiscal year: 2008, 2009, 2010, 2011, and 2012?"
Other questions include, "Where does executive transportation rank on the FBI's priority list for aviation operations?"
The Justice Department did not immediately respond to a request for comment.