In all fairness, I flew into both Puerto Plata and Santiago airports 15 or so years ago. The new airports are a dream in comparison. Also, no more middle of the night rides to Santiago from the airport in Pto Plata or the capital.
I don't know at what point they're paid for (as I'm sure only some of this money goes to the airports, and then much of that would go to employees, electricity, maintenance, etc).
I don't know about Pto Plata, but Santiago airport was also built with private funds and the owners deserve a fair return on their investment which has done a lot for the travelling public and to help businesses prosper in the Cibao region.
SantiagoDR,
No, I'm not thrilled to pay those high fees.
A comparison of domestic travel & int'l travel add-on charges is perhaps not fair as I suspect running immigration and customs on both ends is part of the DR travel fee structure.