With only two they would have to rely on the US for repair/overhaul of Line Replaceable Units since it would not be cost effective to set up a Third Line support for just two birds. Even Second Line (Intermediate Maintenence) will be limited. For two aircraft they would neeed a minimum of two spare engines which must surely cost as much as one aircraft.
If they did get the planes, I should expect them to be frequently grounded Awaiting Parts.