Alaska Airlines cancels 170 flights on Sunday and 60 flights on Monday due to grounding of 171 Boeing 737 MAX 9 airplanes by FAA for inspections. The cancellations affect nearly 25,000 guests. The grounding follows an incident involving an Alaska Airlines jet where a door plug detached from the left side of the aircraft, leading to an emergency landing. FAA emphasizes passenger safety and compliance with aviation standards, stating that the jets will remain grounded until they are deemed safe.