Substitutes may be arranged for charter participants at any time preceding departure. Participants who provide the charter operator or its sales agent with a substitute participant, or who are substituted for by a participant found by the operator, shall receive a refund of all moneys paid to the operator, except that the operator may reserve the right to retain an administrative fee not to exceed $25 for effecting the substitution.

[Docket No. OST-97-2356, 63 FR 28241, May 22, 1998, as amended by Doc. No. DOT-OST-2014-0140, 84 FR 15940, Apr. 16, 2019]