The news of Alaska Air finding no issues in their Boeing 737-900ER checks is likely to be seen as a positive development by investors. It suggests that the airline is taking proactive steps to ensure the safety of its fleet, which could enhance its reputation and customer trust. This may lead to increased investor confidence and potentially a positive impact on the stock price in the short term.

The absence of issues in Alaska Air's checks of Boeing's 737-900ER aircraft can be perceived as indirectly positive for Boeing. It may reduce concerns about potential widespread design problems, which could have led to costly fixes and damaged the company's reputation. This news could therefore have a short-term positive impact on Boeing's stock as it may reassure investors about the airworthiness of Boeing's aircraft.