Bus from the airport to ixtapa

You can walk out the airport, follow sidewalk to the left. When you get outside the chain-link fence you can catch a combi (VW type bus) that has aeroporto/zihua cento painted on the windschield. Take this to Zihua cento get off and wait for a little bigger bus with Ixtapa/Zihua cento painted on the windschield. To my knowledge there is not a direct bus from airport to Ixtapa?