Alaska Airlines was the launch customer for the longest member of the 737 family and operates 12 737-900s. The aircraft were delivered without winglets, but the fleet has now been retrofitted to include the Aviation Partners blended winglets. Hogan makes an excellent push-fit 737-900 that can be made into a very nice model and looks good next to the Hasegawa 737-700 and -800. You can also combine two Hasegawa kits to make a -900, use a plug .272″ forward of the wing and a plug .254″ aft of the wing.