In a large part of the country, terminals would be too far for a drone flight to get to the delivery location. But drones could make it more reasonable to set up locations wherever there is a small airport and fly drones from there. I'm thinking of one of my old service areas about 50 miles from the terminal that had a small airport, and most of the deliveries outside the town itself required maybe 10 miles of driving each on average, and as much as 1 hour or much more between stops. I could manage an average of maybe 40-50 stops while driving 350 miles, in about 9 hours of driving after a couple years learning all the back roads, logging roads, forest service roads and unnamed, unmaintained private roads.. When I left, my replacements kept getting fired for maybe doing 25 a day including the 10-20 in town deliveries on a daily basis. Most of those rural deliveries were withing a 10 mile radius of the airport, but would require a lot of driving. Frones would probably be cheaper, as long as GPS was decent. It is easily possible that even after paying for the drone, a contractor could save money 4-5 drones at the airfield could do the work twice as fast.