Can you fly a jet?
Could you learn to fly a jet?
People claim that too is complicated...
Lets pull it a part. How many man hours are needed?
When did they start to plan 9/11????? 1995? They had more than enough time to either train people or bring in experienced hands.... and do whatever they wanted.... hypothetically speaking.
Maybe we should ask the all time waterboarding champ....
Landing is a bit complicated depending on when and how you are doing it.
Bringing down a building in the way that you are suggesting is very hard, takes a great deal of training and practice and still gets flubbed often enough that they always have a couple of back up plans.
You have to do a number of other things in order to weaken the building so it comes down as well. I believe a group of people knocking out support columns and taking down load bearing walls on every floor would possibly have been noticed.
You might as well be saying that hypothetically speaking the Martians brought them down with anti-gravity rays.
And it is all so needless. The fuel from a fully fueled burning plane that knocked out enough supports to cause the upper floors to begin to pancake works quite nicely.
Also, they didn’t have to do the two most complicated and skill required actions”
1. Take off and clearing the take off airport flight pattern.
2. Landing on an air plane landing strip.