>Yemen, in the midst of a perennial civil war, still runs commercial flights

Not any more, they don't:

> The General Director of Sanaa International Airport, Khaled al-Shaief, said in a post on his X account that the strike had completely destroyed the last of the civilian planes that Yemenia Airways was operating from the airport.

https://www.reuters.com/world/middle-east/israel-says-it-has...

That's just from Sanaa. There are still flights to/from other cities in Yemen, mainly Socotra and Aden.