Yes, but also no.  This product uses models, textures, and sound from the original default; therefore, you must have it installed for this product to be able to find those files.  If you do not, the exterior model might not appear, or there might be pink checkerboard textures in the cockpit, or there might be no sound.  However, if you really want to uninstall the default aircraft for some reason, it is possible for advanced users to copy over the necessary files and link them in this aircraft’s aircraft.cfg, and model.cfg.