Alaska Air Exec Says Saw Broad Based Strength Across Our Network, Premium Demand Continued To Outperform System & Was Up 8% YoY; On Track To Sell All 1.3M Incremental Premium Seats Across The Network Ahead Of Peak Summer Travel Season; First Class Revenue Continues To Produce Positive Unit Revenues; Seattle-Tokyo Service Reached Profitability In March, Less Than A Year After Its Launch; Managed Corporate Demand Remains Robust