While their loss was extremely regrettable, the twin towers do not belong on this list.
Let's re-write your list to be more accurate...
1. Willis Tower (Chicago) - 442.1 m
2. Trump International Hotel & Tower (Chicago) - 423.4 m
3. Empire State Building (New York City) - 381 m
4. Bank of America Tower (New York City) - 365.8 m
5. Aon Center (Chicago) - 346.3 m
6. John Hancock Center (Chicago) - 343.7 m
7. Chrysler Building (New York City) - 318.9 m
8. New York Times Tower (New York City) - 318.8 m
9. Bank of America Plaza (Atlanta) - 317 m
10. US Bank Tower (Los Angeles) - 310.3 m
11. AT&T Corporate Center (Chicago) - 306.9 m
12. JPMorgan Chase Tower (Houston) - 305.1 m
13. Two Prudential Plazza (Chicago) - 303.3 m
14. Wells Fargo Plaza (Houston) - 302.4 m
15. First Canadian Place (Toronto) - 298 m
Here is the list on the diagram section:
http://skyscraperpage.com/diagrams/?searchID=48186329
It seems you missed 2 towers, and instead inserted 2 buildings that do not even exist.
So FCP still ends up in 15th place. Tenth place is 310.3 m, a difference of only 4%. Don't tell me that they aren't even close...
Furthermore, numbers 4, 7, 8, 9, 11 and 13 all have roof heights lower than FCP. Spires give them thier 'official' height. The roof height of #8, the New York Times Tower, is only 227 m, substantially lower than any other tower on this list, and with its skinny little stick of a spire, it would appear alot shorter than all of the other towers on this list, and many more towers that have higher roof heights.
Here is the list of NA's tallest ordered by roof height, with FCP appearing in 9th place:
http://skyscraperpage.com/diagrams/?searchID=48186452