Design city size "Spidercam" style delivery systems https://www.youtube.com/watch?v=dDGAa6ww7S4
3-4 tall pylons with heavy duty winches and kevlar cable linked in the middle to hold a winch system that can lower a delivery box anywhere in the city.
1/4 inch kevlar rope weighs 2lb per 100ft, therefore a 2 mile kevlar rope would weigh 210lbs, but has a load bearing capacity of 9500lbs. So this system would allow accurate delivery anywhere in a 2mile x 2 mile area.
Potentially these could be coupled to allow transfer between areas to allow deliveries to be passed along a chain.
Multiple winches could be stacked on pylons to allow multiple sets of ropes, with winches which are near to delivery/pickup points moved downwards and to lower rope tension to avoid other winches/ropes bumping into them.