There is evidence that the timeline of Star Trek had already diverged from our own by the middle of the 20th century. Are there any materials, at any level of canon, that describe the fate of the Twin Towers (World Trade Center) in Manhattan?
- Were they destroyed on September 11, 2001 as they were in our universe?
- Were they destroyed in some other manner or at some other time (e.g. destroyed by the Xindi, Romulans, Klingons, etc. as an act of war, intentionally disassembled to build a spaceport, accidentally set on fire due to testing a flawed antimatter power inverter coupling as part of an upgrade to their air conditioning system, etc.)?
- Are they shown as still standing at some (post 2001) point and implied to be safe?
- Did they never exist in the Star Trek universe (as @MAGolding mentioned as a possibility)?
If the Twin Towers are actually shown on-screen or spoken of as existing, this counts, even if the reference was filmed/published prior to 2001 when it was assumed that the Twin Towers would not be coming down anytime soon, unless the presence of the Twin Towers has been retconned.