well, you can print on two printers with one queue (That's called printer pooling)
In AIX:
1. you first have to defind the printer queue normally:
a. smitty printers
b. Choose print spooling
c. Add a print queue
2. Then you use the created print queue from the above to creat an additional printer to this print queue
a. smitty printers
b. Choose print spooling
c. Add an additional printer to an existing print queue
That's it, you will be having two printers with one queue.
Regards,
Khalid