originally developed with tnt network for the 2003-2004 season, the "mayday" project was picked up for production for the 2005-2006 cbs season. principal photography took place in toronto, ontario, canada by chautauqua entertainment and the jerry leider co. in association with paramount network tv, at the toronto film studios. filming took place from july 9, 2005 with shooting completed on august 6, 2005.