Could The Government Have Done Something To Prevent 9/11?

The government had been getting warnings about Al-Qaeda's plan to hijack and fly airliners into skyscrapers nearly a year before 9/11. But could the government actually could have done more and prevented the 9/11 Hijackings?

 

Who cares to tell you the truth

Honestly look back on anything bad that happened and you will probilly find a way to prevent it-

Katrina (should have been prepared better for a hurricane)
Space shuttle Columbia (should have checked rocket better)
Pearl Harbor (should have still been on guard even on Christmas)

Anyways its the past and nothing can change it unless you can go back in time. Your always going to look back on something and be like dam I wish i would have done that, its not a perfect world.