to competitive and market-dominant products are properly attributed to those products, including by considering the underlying methodologies in determining cost attribution and considering options to revise such methodologies. If the Commission determines, after notice and opportunity for public comment, that revisions are appropriate, the Commission shall make modifications or adopt alternative methodologies as necessary. 210. Aviation security for parcels Not later than 18 months after the date of enactment of this Act, the Inspector General of the Postal Community shall transmit to the Committee on Oversight and Government Reform of the House of Representatives and the Committee on Homeland Security and Governmental Affairs of the Senate the results of a review of the security measures in place for parcels carried on air carriers to domestic and international destinations for which audit trails are generated. The review required under this subsection shall assess, at a minimum— (1) the effectiveness of the audit trail created by postage evidencing systems that have been validated under the Federal Information Processing Standards in accurately and consistently identifying the senders of parcels carried on air carriers