No. You are not authorized to receive a refund, credit, or any other negotiable document from a carrier for unfurnished services (except as provided in § 301-10.117) or any portion of an unused ticket issued in exchange for a GTR or billed to an agency's centrally billed account. However, any charges billed directly to your individually billed Government charge card should be credited to your account.
Code of Federal Regulations
[FTR Amdt. 70, 63 FR 15955, Apr. 1, 1998; 63 FR 35537, June 30, 1998]