The Lincoln Conservation Commission will hold a public hearing on Wednesday, Feb. 19 at 8:15 p.m. in the Hartwell multipurpose room to hear comments on Jet Aviation’s proposal to expand into Lincoln wetlands buffer zones at Massport’s Hanscom Civil Airport. The meeting was originally slated to be held in the Town Office Building. The proposal was the subject of two recent letters to the editor in the Lincoln Squirrel.