Brazil awarded three European groups on Thursday the rights to operate four airports, drawing nearly double the minimum bids at an auction that underscored investors' appetite for a new wave of privatizations under President Michel Temer. German airport operator Fraport AG, French group Vinci SA and Zurich Airport bid a combined 1.46 billion reais (US$470 million) for the rights to run airports in Porto Alegre, Salvador, Fortaleza and Florianopolis.