A unique and significant part of the nation’s air mobility resources is the Civil Reserve Air Fleet, or CRAF. Selected aircraft from U.S. airlines, contractually committed to CRAF, augment Department of Defense airlift requirements in emergencies when the need for airlift exceeds the capability of military aircraft.
Below you’ll find the USAF Official Factsheet on something that’s been around for a long time.
Most of my deployments to/from the sandbox we flew in and out of theater in one of these contracted carriers.
They’re also used to fly military and their families when assigned overseas. Usually flying out of JFK, ATL, LAX SFO etc to bases overseas like RAF Mildenhal, Ramstien, Yakota to just name a few