frequent flyer miles for this unit's employees has become more problematic since the government contracted with a different carrier for one of the unit's most heavily traveled routes.
The government contracts with carriers, which greatly complicates how they award frequent flyer miles.
mnli hypothesis: The government contracts with carriers, which greatly complicates how they award frequent flyer miles. premise: frequent flyer miles for this unit's employees has become more problematic since the government contracted with a different carrier for one of the unit's most heavily traveled routes.