This would actually be significantly harder than you would think - definitely much more difficult than a 'flag' on your address. Below constitutes my (limited)

This would actually be significantly harder than you would think - definitely much more difficult than a 'flag' on your address. Below constitutes my (limited) experience working as an engineer at a company with a big logistics component (not Amazon). When you run an operation the size of Amazon (or even muuuuch smaller) and are putting out a lot of freight for UPS/FedEx, you batch up your outgoing material based on ship method and 'next hop'. In order to speed up the delivery from a 3-5 day window to a 2 day window, you would have to explicitly purchase the '2 day' shipping option for that customer, or it would get batched in with all of the other 3-5 day goods, which could get sent to a totally different distribution center than the 2 day. We're talking huge numbers trucks all going to "Indianapolis 2 day" versus "Lexington Ground" or whatever - once it gets on that ground shipping truck, I don't think it matters a ton what your address is flagged, as it's going to go that shipping method.