Once you have exited the modeling window, initiate the meshing process by clicking on Mesh in the workflow. If desired, In the Choose display mode menu near the top of the model window, select Translucent display to view what is going on inside the enclosed volume.
Set Mesh Size & Controls
Drag the Mesh resolution slider to the second highest setting. Uncheck the Use predefined settings button and input 10 [degree] for the Curvature normal angle under Global Sizing.
AIM will prompt you to fix the boundary layer before generating the mesh. Click on Boundary Layer under Mesh Controls. Select all of the faces of the airplane body.
Return to the Mesh panel, then click Generate Mesh under Output or at the top of the screen by the status window for Mesh. AIM will detect that you are ready to generate the mesh and highlight the buttons in blue.