Three things with this.
One, the government should seriously tighten its travel approval process.
Two, once it does, it should embrace reality. Limiting the use of business class only to flights that are fourteen hours or more is considered cruel and unusual punishment in the private sector. A more logical and workable number would be eight hours or more, which would nicely eliminate virtually all domestic flights (except to Alaska or Hawaii) and to Paris, London, or Frankfurt, while keeping it open for treks where you actually need it.
And three, if Congress wants to find the most blatant wastes of taxpayer dollars on travel, a mirror would suffice.