(Reuters) – Boeing’s top-selling 737 MAX aircraft is being investigated following an incident last week when a panel blew off an Alaska Airlines plane, forcing pilots to make an emergency landing. U.S. regulators ordered a temporary grounding of 171 Boeing 737 MAX 9 jets installed with the same panel, while investigations and safety checks take place. Here is what regulators and airlines are doing as a result of the latest incident: AIRLINES WITH THE AFFECTED PANEL: ALASKA AIRLINES The airline grounded all 65 of its Boeing 737 MAX 9 planes. It said on Jan. 8 that initial reports from its techn…