The US Bureau of Transport Statistics provides these for US carriers on a monthly basis (a couple of months' delay) at: <a href="http://www.bts.gov/oai/indicators/airtraffic/special/sept_traffic.html" target="_blank">http://www.bts.gov/oai/indicators/airtraffic/special/sept_traffic.html</a>
Some sobering declines from August to September as might be expected. Other stats elsewhere on the BTS site.