(21)Member States should remain competent, in accordance with Union law, to apply the provisions of this Directive to areas not falling within its scope. Member States may therefore maintain or introduce national legislation corresponding to the provisions of this Directive, or certain of its provisions, in relation to contracts that fall outside the scope of this Directive. For instance, Member States may maintain or introduce corresponding provisions for certain stand-alone contracts regarding single travel services (such as the rental of holiday homes) or for packages and linked travel arrangements that are offered or facilitated, on a not-for-profit basis to a limited group of travellers and only occasionally, or to packages and linked travel arrangements covering a period of less than 24 hours and which do not include accommodation.