NextGen
www.faa.gov
2009
<a rel="nofollow" class="external free" href="http://www.faa.gov/nextgen/media/ng2009_implementation_plan.pdf">http://www.faa.gov/nextgen/media/ng2009_implementation_plan.pdf</a> (<a rel="nofollow" class="external free" href="https://web.archive.org/web/20121010074457/http://www.faa.gov/nextgen/media/ng2009_implementation_plan.pdf">https://web.archive.org/web/20121010074457/http://www.faa.gov/nextgen/media/ng2009_implementation_plan.pdf</a>)