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Whenever an air carrier substitutes an aircraft of a different class rate for an Official Airline Guide (OAG) scheduled aircraft, it must notify the Postal Service by filing a completed PS Form 2734, Mail Exception Report, with the local postmaster before the change in flight operations. (See 5-3 for more information on PS Form 2734.) Additionally, the air carrier must submit to WADN, Denver a letter of certification on company letterhead (see 5-3.1.5.1). Whenever an air carrier proposes a substitution, the Postal Service may transfer the mail to another air carrier if it determines that will be more beneficial for the transport of the mail.
A substitution of a bush class aircraft for any scheduled mainline aircraft, or the substitution of a bush 135 aircraft for a bush 121 aircraft, results in payment at the lower rate applicable to the scheduled aircraft. A substitution of a mainline aircraft for a bush rate aircraft, or the substitution of a bush 121 aircraft for a bush 135 aircraft, results in payment at the lower rate applicable to the substituted aircraft. Payment adjustments of the types identified above do not have an effect on the market rate paid. The air carrier records this change in rate on PS Form 2734.
An air carrier is not entitled to compensation for flights using substituted aircraft until it has filed PS Form 2734. Failure to provide this documentation may result in additional penalties (see 1-5).
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