Alaska Airlines and Horizon faced a nationwide ground stop due to a weight and balance system upgrade issue.

Alaska Airlines and Horizon flights faced a nationwide ground stop due to a system upgrade issue, affecting all mainline and subcarrier flights. The Federal Aviation Administration (FAA) issued a ground stop advisory for the airline, and the system upgrade issue related to the calculation of weight and balance for flights. The ground stop was lifted later on Wednesday, with residual delays expected throughout the day.