Should you integrate AS9100

Answer:
I would not recommend having 2 systems for the following reasons:
1) ISO 13485 is the odd standard since it does not follow the same format as the others, so this would be the logical standard to maintain as a separate management system. However, you indicate that you already have this standard integrated with ISO 9001 & ISO14001 so there would be no benefit to have AS9100 as a separate system.
2) Even with ISO 13485 standard following a different format many of the support processes are still the same and have not really changed with the new requirements. These include internal audit, competence assessment, management review, documentation control, etc. Having a separate management system for AS9100 would mean you lose the benefit of integrating these support processes.