Gravity keeps us land-bound, most of the time. But there are two transportation technologies that work with rather than against gravity: cable-cars, which use the weight of anything they are carrying downhill to help lift anything they are carrying uphill; and gliders/parachutes, which mainly travel downhill. The use of cable-cars is limited, however, by their low carrying capacity (relative to trains, trucks, or ships), while the use of gliders and parachutes are limited by danger and imprecision and by the fact that they must still fight gravity in order to get aloft in the first place.
New technologies may overcome these limitations, at least to a certain extent. In the case of cable-cars, there low capacity can become less of a problem as a result of automating loading/unloading/warehousing and automous trucks/cars. With these autonomous sytems in place, a cable car sysyem could run 24-7 (cable-cars are very quiet, so they are not annoying to run at night), with autonomous trucks being autonomously unloaded at the entrance of the cable-car, and then autonomously unloaded and re-loaded onto another autonomous truck at the exit of the cable-car. Similarly, with autonomous cars (or busses), a passenger could disembark his or her car to get on a cable-car, then have another automous car waiting for him or her at the other side.
Autonomous capabilities are even more useful to cargo-carrying gliders or parachutes (or gliders dropping precision parachutes), helping to overcome the limitations of danger and of imprecision. The US military has been making great strides in this area in recent years in Afghanistan, with systems like JPADS (joint precision airdrop system) and research into gliders.
Of course, these systems must still use aircraft get airborne in the first place, which is not sustainable from either an economic or environmental standpoint. This is where things get interesting: what if instead of gliders being released from aircraft, they were instead released from high-elevation cable-car stations? In a mountainous or archipelagic region, this could allow cargo to be transported during times when roads or ships are temporarily out of service as a result of snowfall, flash flooding, avalanches, earthquakes, low tides, etc. They might even be usable by human passengers, to travel to or from an island that lacks an accessible port, or to reach an island on windy days without facing sea-sickness.
Cable-cars might similarly be able to work well with cargo (or passenger) drones in general. They could serve as a sort of ferry for drones. By flying up to land on a cable-car, drones could reduce their energy expendtures, recharge their batteries, and, as a result, reduce their battery sizes.