14 CFR §257.6

1. (a)This Part is effective as of August 25, 1999.
2. (b)Compliance with the following sections is mandatory as of August 25, 1999:
   1. (1)§ 257.1, § 257.2, § 257.3, § 257.4, § 257.5(d), and § 257.6.
   2. (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
      1. (i)Of the fact that the selling carrier is not the transporting carrier and
      2. (ii)Of the transporting carrier's identity (as shown by its two-letter designator code in CRS displays).
3. (c)Compliance with the following sections is mandatory as of March 15, 2000:
   1. (1)§ 257.5(a) and § 257.5(c) in their entirety.
   2. (2)§ 257.5(b) insofar as it requires sellers of air transportation to give consumers
      1. (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
      2. (ii)The same disclosures for long-term wet leases as for code-sharing arrangements.