This day will always be a Tuesday...

It's been three years...yet every time I find myself experiencing a beautiful day, with clear blue skies and perfect temperature, I always think back to another day that started out beautiful. 
I had to go to work at noon that day...at the time I worked for the corporate office of our company's airline.  Security was very high.
A week later, I transferred to the building I work in now.  For a long time, as I was taking the stairs in and out every day, I would think of other people, in other stairwells and other buildings, who might not have made it out. 
I wonder how long this date will make us stop, and think, and pray... I hope forever.