(a) This Part is effective as of August 25, 1999.

(b) Compliance with the following sections is mandatory as of August 25, 1999:

(1) § 257.1, § 257.2, § 257.3, § 257.4, § 257.5(d), and § 257.6.

(2) § 257.5(b) to the extent that it requires sellers of air transportation to give consumers oral notice before booking transportation involving a code-share arrangement

(i) Of the fact that the selling carrier is not the transporting carrier and

(ii) Of the transporting carrier's identity (as shown by its two-letter designator code in CRS displays).

(c) Compliance with the following sections is mandatory as of March 15, 2000:

(1) § 257.5(a) and § 257.5(c) in their entirety.

(2) § 257.5(b) insofar as it requires sellers of air transportation to give consumers

(i) Oral notice before booking transportation involving a code-share arrangement of the transporting carrier's corporate name and any other name under which the service is held out to the public and

(ii) The same disclosures for long-term wet leases as for code-sharing arrangements.