Currently, the Trust Fund may cover both capital and operating costs. In FY 2013 and FY 2014 it provided all of the funding for three of FAA's four accounts, including:

  1. The Facilities and Equipment (F&E) account, which funds technological improvements to the air traffic control system;
  2. The Research, Engineering, and Development (RE&D) account, which funds research on issues related to aviation safety, mobility, and the environment; and
  3. The Airport Improvement Program (AIP), which provides grants for construction and safety projects at airports.

The Trust Fund also provides a portion of the funding for FAA's Operations account; it provided about 54 percent in FY 2013 and 67 percent in FY 2014. The remaining portion of FAA's Operations account is funded through the General Fund.