How can I get Ai aircraft to fly close

Hi all
I want to set up an Ai flight plan and have several aircraft fly as close to each other as possible. Can it be done, and what is the best way to do this.
Cheers Rhys
I want to set up an Ai flight plan and have several aircraft fly as close to each other as possible. Can it be done, and what is the best way to do this.
Cheers Rhys