Option: Plane

Pros

Diverse

Planes are not dependent on the quality and/or presence of roads, so they can be used in both urban and rural areas, making the plane a very diverse option and suited for all kinds of environments.

Shortest routes

In addition to the plane not needing roads to fly to the right destination, planes can take the shortest route through the air, reducing travelling time (and costs).

Fast

Because planes will fly high above the regular traffic, they can travel at high speeds with little chance of getting into a collision. This would improve delivery time. However, if more and more of these delivery planes would fly in the air, there needs to be an aircontrol or plan or something to regulate traffic in the air.

Relatively cheap

There needs to be an investment to start up, but after that, costs are relatively low.

Sustainable

Ideally, the planes would run on green electricity. This is beneficial for the environment in comparison with cars and trucks that are being used today.

Cons

No delivery at door, landing strip needed

Because a plane is relatively unflexible when it comes to taking off and touching down, a landing strip is needed and it is hard to deliver packages right in front of someone's door. People would need to go outside and grab their package, which is inconvenient if people are in their pyjamas and/or the weather is bad. In addition, in the urban environment it is impossible to create a landing strip for every household or street. This is necessary, because the regular roads would be occupied by the regular traffic.