Move comes in tight labor market as UPS launches plan to hire 100,000 in same period.

Purchase brings UPS’ fleet of that model to 108 planes, as Boeing forecasts that global freighter fleet will grow from 2,250 in 2022 to 3,610 airplanes in 2041.

But long term outlook is helped by April passage of postal reform act, easing payment of employee health and retirement benefits.