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They use their own vans.

edit: They basically leverage their amazon fresh / amazon now deliveries.

Not always. My same day stuff came with OnTrac.

That's a story I'd love to read about. OnTrac seems to use basically junker cheaply painted white mid-90s minivans whenever I see them about. They simply slap a magnet with OnTrac on it and it becomes a fleet vehicle.

While FedEx/UPS have their own custom designed fleet, OnTrac seems to scour auto auctions for theirs.

I think for west coast customers Amazon uses them. The reason could be - http://www.ontrac.com/ontracground.asp

The same-day items I've received have been delivered by people wearing Amazon-logo shirts but usually in solid-colored vehicles with no markings.

In some cases in NYC Amazon is using the subway

I think it depends on the market and probably the item / load level. I had a same day item the other day and it was fulfilled by OnTrac.