Step 1: Prepare 12 squares + 4 triangles to build plane body.
Step 2: Assemble main body element.
Step 3: Use 8 triangles + 2 hollow squares to build each wing.
Step 4: Add 2 squares to each wing to complete wing structure.
Step 5: Attach wings to body.
Step 6: Assemble cabin element using 4 right triangles.
Step 7: Build tail element using 1 hollow square + 2 right triangles.
Done!