Very true. But none of the hijacked airliners landed.If your mission is to distribute a bio agent over a large city, accuracy is not required. If the winds are out of the north, you launch due north of town. It sounds as though you know a great deal more about the subject and ballonists than I do, but I do think it would be wise for the ballonist community to be aware of the depiction on the calendar, especially if the month with the ballons is not June, the month of the Six Day War.
I am going to notify several parties and try not to panic anyone. ;) I'm sure their security is going to be exceptionally tight this year.
I certainly wouldn't want to be responsible for Albuquerque getting cancelled.