Jeff Smisek, CEO of United says he would not urge regulators to block a tie-up between American and US Airways, even though it could weaken the global airline alliance that his carrier belongs to. He also launched a scathing attack on US lawmakers, accusing them of “doing their best to destroy” his industry, and contrasted this with the United Arab Emirates’ strong support for fast-growing Gulf carriers, which he described as a “significant” strategic threat.