Why did USPS get rid of their 727 planes back in the day?

Question

I at first didn't know USPS had planes, but it looks like they used to have a fleet of 727s to carry mail between cities. Why did they get rid of them?

Answer 1

They were to small to carry the volume of cargo they had and expected growth. The 727 was a fuel hog. Although, they were fitted with better, fuel efficient engines, they still required more fuel than a larger 2 engined cargo plane.

When you can fly a large Boeing or AeroBus for 1/3 less than a 727, and fly longer distances, it's a no brainer!

Answer 2

probably because UPS put em out of the air freight business. How do you compete with guaranteed next-day delivery? LOL