How much should security cost passengers?

"A Bush administration proposal to increase security fees on airline tickets could cost Northwest Airlines up to $150 million a year, CEO Doug Steenland said.
"'This is an issue of national defense, and it shouldn't be borne by just one segment of the population,' Steenland said in an interview. ...
"U.S. Rep. James Oberstar, D-Minn., disagrees. When terrorists used commercial aircraft to crash into the World Trade Center and Pentagon, the planes were just a means to an end to attack the United States, he said. 'Aviation security is not an airline matter, but a national security matter,' Oberstar said. ...
"'A disproportionate amount of the increase is likely to be absorbed by the airlines rather than the consumer,' said Merrill Lynch analyst Michael Linenberg in a February report."
in the minneapolis star-tribune