Not really, only
IPX pilots were “folded into” UPS Airlines. (which is why UPS airline code is still
5X).
Initially they hired many Orion Air drivers but eventually most of ups contractor-pilots were given preferential interviews.
____
Condensed UPS Airlines history from Wikipedia.
“...In contrast to chief competitor Federal Express (which owned its own aircraft), in the early 1980s, air operations of UPS were undertaken by several contractors, including Evergreen International Airlines, Interstate Airlines, Ryan Air and Orion Air. Through its contractors, UPS flew its packages using a fleet of commercial aircraft converted to freighters, including Boeing 727-100s, 727-200s, Douglas DC-8s, and Boeing 747-100s.
...
In 1986, in an effort to obtain service rights to Japan, UPS entered into a joint venture with DHL, named International Parcel Express (IPX).
IPX was rejected for use in Japan, leading UPS to purchase the DHL share of the joint venture in 1987.
At the end of 1987, UPS ended the use of contract flights by Evergreen, Ryan, and Orion. Using the flight certificate intended for the IPX joint venture, the renamed UPS Airlines commenced operations in January 1988, adopting many flight crews from Orion Air...”
https://en.m.wikipedia.org/wiki/UPS_Airlines