It's been nearly a year since I accidently enrolled in Amazon Prime, and now I don't know what I'd do without free two-day shipping. Author's Note: How Amazon Same-day Delivery Works Until then, we'll have to wait at least an hour for Amazon orders, or, heaven forbid, two whole days. That's still awaiting regulatory approval from the Federal Aviation Administration, though.

And then, of course, there's the famous Prime Air, which proposes to deliver packages in 30 minutes or less using drones. They're also experimenting with services like Prime Now that could shorten delivery time to an hour - something they're already doing in Manhattan, Brooklyn, Miami and Baltimore. What's next for Amazon same-day delivery? Certainly they will be looking to expand the service as competition from rival retailers increases. It was likely that level of success that led to the free option introduced in 14 cities in May 2015. By 2014 customers were really embracing the service, ordering 10 times as many items with same-day delivery that year over the previous one.

Perhaps wary because of past debacles, they started off slowly, offering the service in just seven cities and charging a $6 fee for Prime members and $15 for non-members. That's the challenge Amazon faced when they first tested same-day delivery in 2009: How to deliver orders quickly without going broke.

Amazon next day delivery