Retreadfed-apologies! Let me restate:
The clause is 52.247-63, Preference for U.S.-Flag Air Carriers. Specific direction is given here:
47.405 Contract Clause
The contracting officer shall insert the clause at 52.247-63, Preference for U.S.-Flag Air Carriers, in solicitations and contracts whenever it is possible that U.S. Government-financed international air transportation of personnel (and their personal effects) or property will occur in the performance of the contract. This clause does not apply to contracts awarded using the simplified acquisition procedures in Part 13 or contracts for commercial items (see Part 12).
BLOCKEDwww.acquisition.gov/sites/default/files/current/far/html/Subpart%2047_4.htmlBLOCKED
On your question regarding incorporation of JTR and FTR Regulations themselves and not just per diem numbers... this is important because JTR and FTR include the Fly America Act. If the regs were really incorporated into FAR 31.205-46, the Fly America Act would be automatically included as soon as FAR 31.205-46 was included.
Here is the link for FAR 31.205-46 http://www.gpo.gov/fdsys/pkg/CFR-2010-title48-vol1/pdf/CFR-2010-title48-vol1-sec31-205-46.pdf
Page 676 says
(4) Subparagraphs (a)(2) and (a)(3) of this subsection do not incorporate the regulations cited in subdivisions (a)(2)(i), (ii), and (iii) of this subsection in their entirety. Only the maximum per diem rates, the definitions of lodging, meals, and incidental expenses, and the regulatory coverage dealing with special or unusual situations are incorporated herein.
Does that clarify?
Your comments very appreciated.