who does 2nd day delivery

[Bimmer]

Im expecting a package today, I got 2nd day delivery on it. My ? is who does 2nd day delivery, UPS, fedex, or USPS? Just wondering who to expect it from

 

[Railrunner]

In my expierence, they all do 2 day!

Most sources only use USPS.

 

[joltan]

usps priority mail usually take 2-3 days