View Here : Onstar Vs Aaa
OnStar is part of the cars internal system whereas AAA has to be reached by a phone call. If your in an accident and the airbags deploy the car automatically contacts OnStar.
OnStar vs. AAA However, My 2006 Subaru Tribeca has no similar coverage, and I am considering a AAA membership for $69 for my wife and I. Unlike OnStar's plan, AAA covers the member rather than the vehicle, so AAA would provide roadside assistance for either car, as well as any other car I am driving or a passenger within.