[Pukin Dog]

Many reasons why the C-5 would not make a good airliner.

One, the sucker is not a comfortable ride. I don't know if the C-5 has a yaw-damper system like modern airliners.

Two, maintenance and cost of operation.

Three, you have to consider turnaround times, gates, taxiways, ramps and divert fields available for in-flight emergencies that could handle that beast.

[namsman]

I'm sure it does. Every large, swept-wing aircraft is subject to dutch roll. A yaw damper is the only way to control it.