"However, this notice gives us additional flexibility including pursuing an IPO or a disposal option which may be a way to optimize returns for shareholders." A source close to AAR, who refused to be named because he was unauthorized to comment publicly, said that AAR may be able to sell its stake through an IPO in case Rosneft buys out BP. The source said that Russian group's move would provide the Russian shareholders with an exit strategy in case Rosneft wins the bid for BP's stake.