I am wondering why. Both names end in a v, but one is given an -sk suffix, and the other isn't. Is there some rule about this? Does the -sk suffix mean anything?
Note: I have a similar question. That one is more about general city names, but this one is more of a specific case because Chkalov has no suffix, prefix, or any modifications to the name whatsoever. I'm wondering why. "Chkalovsk" sounds better to me, like Sverdlovsk.