Other people's descriptions that are better than mine...

(The cities change sometimes monthly, so the DLH flight may now be the ATW flight, etc.)

Have Recessions Absolutely, Positively Become Less Painful? - New York Times

"On a typical night, one of the five makes an unexpected stop to collect an overflow of packages, one lands to bail out a plane needing a repair, and three arrive in Memphis as empty as they were when they took off."