Two AOCs
Buying a second AOC a in case of a problem does no good.
Dieter Siewert from Airtex had two: Airtex and one other, when the S**T hit the fan after the Canleyvale accident CASA deemed them to be one and the same even though they were totally independent under seperate corporate entities and ownership.
Result both suspended and cancelled in unison.
Legally I'm not sure it was cosher but hey what is a little thing called LAW to CASA. Safety is paramount