more mini than that
Really doesn't change much. You have a bigger problem controlling the burst on a .30 cal. You would have to be very close either head on or 90 degree attacks. Finally, the GAU would have to be on something that is faster than the airliner. Gun pods won't get it done. Finally, have you ever seen what a GAU .30 does to aluminum in the above scenario. Shreds it, followed by aircraft failure due to aerodynamic forces.