Structural reforms on Capitol Hill fall short, experts say.
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Although 9/11 panel found maritime or surface transportation have greater risk of attack, aviation continues to draw most dollars.
Auditors find that multiple departments share responsibility for key initiatives, raising questions about overall coordination.
Eight additional Air Force deals worth about $3 billion will be scrutinized.
If Senate followed House plan, Kay Bailey Hutchison, R-Texas, would end up losing her subcommittee chairmanship.
DHS still allowed to assign risk levels to passengers and prevent them from boarding planes while system is being tested.
Sen. George Voinovich, R-Ohio, wants to see the results of efforts at Homeland Security and Defense before taking reform governmentwide.
Holdup over contentious FBI memo and debate on class-action overhaul measure pushes back Senate vote until next week.