Unless you've had to request a top speed delivery in the past, you might have no idea how fast your Chicago courier service can make a delivery. You might not also realize that there are a lot of different options regarding the speed at which you want your deliveries to be made. Couriers usually have a very wide variety of delivery speeds available from you to choose from. The speed at which they can make a delivery depends mostly on how far you are shipping, and how much you're willing to pay.
Common sense tells us that generally speaking, the faster you want your delivery made, the more money it is going to cost you. Certain delivery speeds are not going to be available though if you're shipping further than the zones in which they are available. The easiest example of this is that while many courier companies offer one hour deliveries, those options are usually only available within a single city, or possibly between two adjoined cities.
There are still some very fast shipping methods to ship much further than within a single city though. There are couriers now which offer next day service over the entire continent. Even more surprising perhaps, is the fact that there are same day couriers who can reliably deliver your shipments anywhere in the country, with coast to coast same day deliveries being made every day. This type of speed represents a great deal of potential for companies to widen their target customer range.
There are some categories of shipping which basically mean "as fast as possible" and these can often surpass even the times that will be achieved when you order something like same day shipping. For long distance, including international shipping, the fastest way to go is usually NFO, which means next flight out. To ship a long distance in a short amount of time you need to use airlines, and NFO means that they will have your package in the air as soon as possible.
Rush delivery is the fastest ground service available. This is so fast because unlike every other delivery model, with a rush order the courier is only going to be concerned with your shipment. They aren't going to stop to make other pickups or drop off other packages, and are just going to come straight to you, and then make the delivery as fast as possible.