47 CFR § 3.22 - Number of accounting authority identification codes per applicant.
(a) No entity will be entitled to or assigned more than one AAIC.
(b) AAICs may not be reassigned, sold, bartered or transferred and do not convey upon sale or absorption of a company or firm without the express written approval of the Commission. Only the FCC may certify accounting authorities and assign U.S. AAICs for entities settling accounts of U.S. licensed vessels in the maritime mobile and maritime mobile-satellite services.
(c) Accounting authorities who are “grandfathered” during the initial application period may retain their interim AAIC.