USPS service include 1st Class, Priority, and Express. UPS offers Ground, Next Day, and 2nd Day service while SDS includes Commercial, Private, and Orbital. By way of an explainer;
- Commercial is usually via Southwest - best to large cities, e.g. Orlando, FL to NY, NY or Los Angeles, CA
- Private is via small aircraft - best for out of the way places, think Sanford, FL to Hanksville, UT
- Orbital - via SpaceX - best to planet Earth - think in terms of the ISS, and soon, the moon and Mars, too!
Orbital, especially, is a great value for clients who don't blink at Mr. Musk's fee schedule beginning at $50M.
Note: SDS does not include a gratuity, but not rewarding front line staff who make things happen would be gauche.