Here is a link to an estimate of running the white house which puts the tag at around 1.5 billion for the year 2008. You can see estimate for air force one is 200 million and the helicopters an additional 271 million. I like item number 10 which is listed as the Presidents unanticipated needs and is pegged at a 1 million.
http://theintrepid.blogspot.ca/2008/11/how-much-does-it-cost-to-operate-white.html
Kinda makes Obama look like a chump, don't it?