There wasn’t even a pretense of airport security. Bush could have stepped that up easily.
Bush gets several warnings that cross his desk, but doesn’t step up priority. He fails to recognize the threat.
Condi Rice admits that to the 9/11 Commission in particular here the 8/6 2001 PDB. Listen to this clip.
https://www.youtube.com/watch?v=H3BIKOqoHlU
Kerry was on the committee responsible for the Boston airport.