evidence: This is the accessible text file for GAO report number GAO-10-542 entitled 'National Airspace System: Setting On-Time Performance [...] Every attempt has been made to maintain the structural and data integrity of the original printed product. Accessibility features, such as text descriptions of tables, consecutively numbered footnotes placed at the end of the file, and the text of agency comment letters, are provided but may not exactly duplicate the presentation or format of the printed version. The portable document format (PDF) file is an exact electronic replica of the printed version. We welcome your feedback. Please E-mail your comments regarding the contents or accessibility features of this document to Webmaster@gao.gov. [...] OPSNET, 34 OEP Airports, 2009: