Boeing CEO Dave Calhoun will meet this week with U.S. senators to answer questions about the 737 MAX 9 grounding, as executives for longtime customer United Airlines raised questions over billions of dollars of orders for MAX 10 jets. Calhoun is set to hold meetings starting Wednesday on Capitol Hill. He is scheduled to meet with Senators Ted Cruz, a Republican, and Mark Warner, a Democrat, among others following the mid-air blowout of a cabin panel on a new Alaska Airlines jet, sources told Reuters. Boeing declined to comment.