The registration of an air taxi operator may be canceled by the Department if any of the following occur:

(a) The operator ceases its operations;

(b) The operator's insurance coverage changes or lapses;

(c) The operator fails to file an amended registration when required by § 298.23;

(d) The operator's Air Carrier Certificate and/or Operations Specifications is revoked by the Federal Aviation Administration;

(e) The operator fails to qualify as a citizen of the United States;

(f) The Department determines that it is otherwise in the public interest to do so.