Certainly can, even temporarily (this is an A380, but I assume it works for any aircraft). https://www.cnn.com/travel/article/a380-hi-fly-auxilary-freighter/in

Certainly can, even temporarily (this is an A380, but I assume it works for any aircraft). https://www.cnn.com/travel/article/a380-hi-fly-auxilary-freighter/index.html https://www.cnn.com/travel/article/a380-hi-fly-auxilary-frei...