Methinks this says is all, from
www.fas.org/sgp/crs/weapons/RL34264.pdf Scroll down to page 30, if you want to see the whole thing.
The An-124 Condor is a strategic lift aircraft larger than, but comparable to, the C-5. It also appears that DOD use of An-124 missions is accelerating. Some contend that while C-5s may not be as modern as C-17s, or able to operate from as many runways, the fact that DOD is outsourcing missions to Russian aircraft indicates C-5s offer important capabilities other U.S. aircraft may not be able to satisfy. In contrast, it is possible An-124 contract missions may be the result of the convenient availability of relatively low-cost airlift near a busy theater of operations. Since the Air Force retired 14 C-5s in 2004, the number of An-124 missions has increased. During congressional testimony*, Gen. Schwartz explained that costs associated with transporting Mine Resistant Ambush Protected (MRAP) vehicles to Iraq were about $130,000 per MRAP for both C-5s and An-124s — and less expensive than moving them on C-17s. However, he suggested An-124 reliability made it the logical choice stating, “because kids are in jeopardy, I’m not going to have airplanes broke in Europe or somewhere else when I have an alternative which, to date, has not resulted in a late delivery.” Perhaps DOD is already exploiting commercial aircraft to its maximum potential. The Air Force indicates in the MRS-05 study that it could not use the 20.5 MTM/D of CRAF capability assigned for most of the halt phase of the wartime scenarios studied, because of the limitations listed above. Likewise, planning to utilize foreign-owned contract carriers during contingency operations might be risky because of potential political constraints a foreign carrier’s government may impose on their use.
*Hearing of the Senate Homeland Security and Governmental Affairs Committee, Federal Financial Management, Government Information, Federal Services, and International Security Subcommittee on Military Airlift Costs, September 27, 2007.
The General's reliability comment is particularly disturbing, but not surprising however, because we got our Deep Pac combi contract back after losing it to C-17 units when the places we had been serving faithfully and with over 90% reliability for many years couldn't take the lack of service any more.
DoD contract companies, including airlines, are limited in what they can make from the US government. Outside of CRAF activation, I believe the number is on the order of 70% of their total revenues, but don't quote me on that.