Yes, except when the trips are classified, you must report to GSA's Office of Governmentwide Policy (MTT) all uses of your aircraft for travel by any senior Federal official or non-Federal traveler, by using an electronic reporting tool found at http://www.gsa.gov/sftr, unless travel is authorized under 10 U.S.C. 2648 and regulations implementing that statute.
Code of Federal Regulations
[FTR Amdt. 2010-04, 75 FR 59095, Sept. 27, 2010]