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by Animats 4010 days ago
"I have a feeling that we'll solve self-driving cars to your driveway a long time before we solve getting the package from there to a person/porch/mailbox."

Covering the last 50 meters with a quadrotor has potential. With very short flights and frequent recharges, the carrying capacity could be quite high. You could also deliver to apartment building balconies or trays mounted outside windows.