Hmm .. ferrying A320 ? Private flight ? I suspect not. So, you are flying for 'reward' and therefore you are travelling 'on business' and need a visa.
I hold B1/B2, C1/D USA visas in my passport (EU/British) for my occasional ferry work. So the Visa Waiver Program is irrelevant for me.
Strongly recommend that you check very carefully indeed before travelling on just VWP for what you appear to be planning to do.