Ticket agents at the Seattle-Tacoma International Airport (SEA) were busy Friday as groundings of Boeing's 737 Max 9 planes coincided with issues caused by winter weather. It comes as Alaska Airlines extends the cancellation of all flights aboard 737 Max 9 aircrafts through Tuesday, impacting more passengers. As of Friday, Alaska Airlines said it is still waiting for instructions from Boeing and the FAA to inspect its fleet. The airline wrote in a statement that it regrets the disruption, but "the safety of our employees and guests is our highest priority and we will only return these aircraft to service when all findings have been fully resolved and meet all FAA and Alaska’s stringent standards." Alaska Airlines has 231 total 737 aircrafts in its fleet, and of those, 65 are 737 Max 9s. Through Sunday, Jan. 14, Alaska Airlines said nearly 5,000 people will fly on 90 flights to destinations on Horizon jets, Alaska's regional carrier, instead of on a 737 Max 9 aircraft as originally scheduled. READ MORE: https://www.king5.com/article/travel/alaska-airlines-extends-cancellation-flights-737-max-9-aircrafts/281-79f15900-86ed-45ac-86b8-5de9a63f032a