Zipline is doing it now for medical supplies (even for things like COVID-19-related PPE) every day and night in Rwanda, Ghanda, and expanding to India and the Philippines (with test operations in the US).
> They have been solving these problems operationally for years now.
Emergency medical supplies (the twitter mentions "Lifesaving deliveries by drone") is quite different than delivering packages. That you can get something up and running for lifesaving stuff is one thing. Doing the same for my 0.50 EUR AliExpress package is different though, I'm not going to be home. If it's lifesaving I'd imagine you need it asap and someone will ensure that they'll be waiting for the package.
https://twitter.com/zipline/status/1245333880930029570
They have been solving these problems operationally for years now.