This is my personal opinion, and does not represent the opinions in ATC Playground Crew.
I think this event is in many ways disrespectful, and I’m not american, so this is from an international, non-patriotic point of view. First of all, this was an incident involving airplanes. Making an event based upon a terrorist attack itself is not such a good idea - when airplanes were involved - even worse.
I understand that there are memorial flights for almost every aviation incident, but those are mostly on accidents and crashes, not terrorist attacks.
Second of all, since this event is located in the New York region, people (including me) can misinterpret the event for a “remake” of the attack. I understand that this is not the purpose, but I can also understand that people - especially Americans - can become upset over this event. And to avoid unecessarry debate, confusion and anger, I think it’s best to not go through with this event. Do not take me wrong, I really understand that this is to remember the deceased, but I can just imagine how big of a debate this is going to be when ‘AAL11’, ‘UAL175’, ‘AAL77’ and ‘UAL93’ start appearing in the New York region.