Delta continues to show why it has become the de facto leader of the U.S. airline industry, not only for its superior financial performance but also for its willingness to take chances and to speak up – particularly in regard to the Export-Import Bank. The bank’s charter expires Sept. 30. Congress is considering whether to reauthorize it. Last week, the Republican Study Committee considered whether to support the reauthorization. The bank devotes bout 40% of its resources to backing loans to buyers of Boeing jets by foreign carriers who compete with Delta and other U.S. carriers.