This document contains proposed regulations relating to the excise taxes imposed on certain amounts paid for transportation of persons and property by air. Specifically, the proposed regulations relate to the exemption for amounts paid for certain aircraft management services. The proposed regulations also amend, revise, redesignate, and remove provisions of existing regulations that are out-of-date or obsolete and generally update the existing regulations to incorporate statutory changes, case law, and other published guidance. In addition, the proposed regulations withdraw a provision that was included in a prior notice of proposed rulemaking that was never finalized and re-propose it. The proposed regulations affect persons that provide air transportation of persons and property, and persons that pay for those services.