shall submit regular reports to Congress on the progress of the preparation of the Department of Transportation and of the Corporation for the transfer of operational control of air traffic services under this subtitle. (b) Timing The reports described in subsection (a) shall be submitted, at a minimum, on a quarterly basis until the date of transfer. (c) Sunset This section shall expire on the date of transfer. (d) Statutory construction Nothing in this section may be construed to limit the authority of the Inspector General of the Department of Transportation to conduct oversight of the Department of Transportation’s interactions with the Corporation after the date of transfer. 91502. State of air traffic services (a) Report Not later than 2 years after the date of transfer, and every 2 years thereafter— (1) the Corporation shall submit to the Secretary a report on the state of air traffic services