(a) Except as provided in paragraph (b) of this section, no certificate
holder may conduct a kind of operation for which it holds authority in its
operations specifications unless the certificate holder has conducted that
kind of operation within the preceding number of consecutive calendar days
specified in this paragraph:
(1) For domestic, flag, or commuter operations -- 30 days.
(2) For supplemental or on-demand operations -- 90 days, except that if
the certificate holder has authority to conduct domestic, flag, or
commuter operations, and has conducted domestic, flag or commuter
operations within the previous 30 days, this paragraph does not apply.
(b) If a certificate holder does not conduct a kind of operation for
which it is authorized in its operations specifications within the number
of calendar days specified in paragraph (a) of this section, it shall not
conduct such kind of operation unless --
(1) It advises the Administrator at least 5 consecutive calendar days
before resumption of that kind of operation; and
(2) It makes itself available and accessible during the 5 consecutive
calendar day period in the event that the FAA decides to conduct a full
inspection reexamination to determine whether the certificate holder
remains properly and adequately equipped and able to conduct a safe
operation.