47 CFR § 61.59 - Effective period required before changes.
(a) Except as provided in § 61.58(a)(3) or except as otherwise authorized by the Commission, new rates or regulations must be effective for at least 30 days before a dominant carrier will be permitted to make any change.
(b) Changes to rates and regulations for dominant carriers that have not yet become effective, i.e., are pending, may not be made unless the effective date of the proposed changes is at least 30 days after the scheduled effective date of the pending revisions.
(c) Changes to rates and regulations for dominant carriers that have taken effect but have not been in effect for at least 30 days may not be made unless the scheduled effective date of the proposed changes is at least 30 days after the effective date of the existing regulations.