The 737-400F was a type of 737-400 designed to carry cargo.
A garage space in the back can carry a car or other cargo.
How much cargo you carry plays a part in this.
Especially in view of the fact that you carry such precious cargo.
It carried both cargo and passengers, for nearly a century.
The 737-700C is a version where the seats can be taken out to carry cargo instead.
American Airlines eventually only used its 747s to carry cargo.
Now, with any luck, it would carry a very different cargo.
The flight was carrying cargo only and all six crew were killed.
Why else build such an enormous ship, if not to carry great cargo.