Young says the fourth person who died - the pilot -was the husband of one of the employees.
FAA spokesman Ian Gregor says the Socata TB-21 aircraft was flying from Durango to the Snowmass Resort in Aspen for a holiday party when it crashed Saturday in an area north of Silverton.
Montrose Police who joined in a multi-agency search after an alert was issued found debris from the crash shortly before 3 p.m.
Authorities say they have only recovered two bodies.
The San Juan County Coroner's Office identified the victims as Jenna Rich, 26, and Tyler Black, 24, both of Durango.
Search crews have not found the plane's other two occupants due to new snow fall and steep, rugged terrain in a heavily wooded forest near timberline, between 10,000 and 11,000 feet.
(KUSA-TV © 2011 Multimedia Holdings Corporation with The Associated Press)