; (B) the exception under that paragraph on which the head of the agency or the White House Chief of Staff relied when authorizing the travel; and (C) the cost of any flight in other than coach-class accommodations with respect to the waiver. (3) No blanket approval The head of the agency employing a covered employee (or to which a covered employee is applying, as applicable), or in the case of the head of an agency, the White House Chief of Staff, may authorize a covered employee or an agency head, as applicable, to use accommodations other than coach-class accommodations for official travel only on a case-by-case basis, unless the covered employee or the agency head has a disability or a special need that has been certified under paragraph (4). (4) Certification of disability or special need (A) Disability (i) In general A disability described in paragraph (1)(A)(ii) shall be certified annually, unless the disability is a lifelong condition, in which case the disability shall be certified once. (ii) Contents A certification required under clause (i) shall include, at a minimum— (I) a written statement by a competent medical authority stating that a special accommodation for the covered employee is necessary; (II) an approximate duration of the special accommodation described in subclause (I)