Because the total losses from unprofitable routes are greater than before, the government would have to increase its subsidy.
There's a subsidy that the government might have to increase because unprofitable routes are costing more.
mnli hypothesis: There's a subsidy that the government might have to increase because unprofitable routes are costing more. premise: Because the total losses from unprofitable routes are greater than before, the government would have to increase its subsidy.