The best replacement for 9 11 is pearl harbor.

The best alternatives to 9 11 are rated as following:
★★★★★  pearl harbor
★★★  hurricane katrina
★★★  montgomery gi bill
★★  titanic
★★  mgib
★★  katrina
★  fahrenhype 9 11
★  september 11
★  world trade center
  11 9
  fahrenheit 9 11
  controlled demolition
  fahrenheit 451
  gi bill
  post 9 11

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Speaking about 9 11, one probably shouldn't forget about pearl harbor.

Other search terms related to 9 11 and their ratings are:
★★★★★ pearl harbor
★ planes
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Google Trends

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9 11
pearl harbor
hurricane katrina