The Globe and Mail reports in its Thursday edition that a cabin blowout at 16,000 feet and the grounding of more than 170 Boeing jets have rekindled frustration among airlines over the plane maker's struggle to contain a series of safety and supply crises. A Reuters dispatch to The Globe says that Alaska Airlines, which operated Friday's domestic U.S. flight, and United Airlines together have 70 per cent of the Max 9 fleet and have cancelled hundreds of flights. With provisional checks turning up loose bolts in some of the grounded planes, the return to service could be slow. Some analysts have already trimmed first-quarter profit estimates for both the carriers. Boeing chief executive officer Dave Calhoun on Tuesday acknowledged mistakes and told staff he and many customers had been "shaken to the bone. ... In the next couple of weeks, we will be under siege," Mr. Calhoun warned. A series of production problems has delayed Boeing's aircraft deliveries, making it harder for airlines to capitalize on demand. Supply chains remain tight across the industry owing to parts and labour shortages. American Airlines CEO Robert Isom publicly asked Boeing's senior management group last year to "get their act together."