Section 257.6 - Effective and compliance dates(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.64 FR 46821, Aug. 27, 1999