Should be insurance cover under airlines operating policy covering costs and expenses resulting from regulator initiated actions in response to a wider global aviation event. Though I doubt insurance underwriters will sit back and accept such risk specific to any new aircraft scenario. Possible some underwriters may look to exclude potential cover relating to a specific new aircraft. In which case, if product defect determined and manufacturer negligence determined, that may present route to legal remedy, perhaps? Could product modifications after the event be considered an admission of an issue in the inherent product safety? Who knows, only the lawyers and courts will decide.