Del. Code tit. 21, § 403

An agreement or arrangement entered into or a declaration issued under the authority of § 401 of this title may authorize the registration or licensing in another jurisdiction of vehicles located in or operated from a base in such other jurisdiction which vehicles otherwise would be required to be registered or licensed in this State, and in such event the exemptions, benefits and privileges extended by such agreement, arrangement or declaration shall apply to such vehicles, when properly licensed or registered in such base jurisdiction.