See more of our coverage in your search results.Delta CEO Ed Bastian warned Friday that travelers could see higher airfare costs continue even as oil prices fall from multi-year highs – which he expects will help boost the carrier’s profits to hit its annual goal.“I think it’s sustainable,” Bastian told CNBC when he was asked about high ticket prices, nodding to robust travel demand, more seating options and an industry that has been burnt in the past – and is hesitant to expand capacity as soon as oil star ...