This is straight from Atlas careers page:
Atlas Air First Officer Minimum Requirement:
The First Officer minimum requirements below have changed to include restricted ATP holders.
FAA Multi-Engine Airline Transport Pilot Certificate or Restricted Multi-Engine Airline Pilot Certificate
* 2000 hours of total time
* 500 hours turbine
or
* 1500 TT
* Graduate of 141, 142 or US Military Training Program
* Holds an SIC/PIC Type Rating in a Turbojet Aircraft
* Current FAA Class 1 Medical Certificate
* FCC Radio License
* Legally authorized to work in the United States
* No restrictions on international travel
* Current Passport
* Ability to pass a 10-year security background check and a pre-employment drug test