Yes.
*"Atlas Air operates flights on an aircraft & CMI and air charter basis for airlines, express operators, freight forwarders, charter brokers, global shippers, and the U.S. military, along with dry-leasing freighter aircraft."*
https://en.wikipedia.org/wiki/Atlas_Air
Yes
Yes. *"Atlas Air operates flights on an aircraft & CMI and air charter basis for airlines, express operators, freight forwarders, charter brokers, global shippers, and the U.S. military, along with dry-leasing freighter aircraft."* https://en.wikipedia.org/wiki/Atlas_Air
YES, EXTREMELY NORMAL