That's a hand you have to get away from... he obviously REALLY likes his hand... the "please call this" bet on the flop and then the check-all-in on the turn... Only a terrible player is going that big against someone ELSE who obviously likes their hand without something really strong. Unless you have a read on someone as a terrible player... treat them like they have a clue, and no one with A9 bets like that if they have a clue