I don't think we really need another airstrip, but we definitely need the training blessing to apply to the airstrip as well!!! It take way too long to train planes!
Guys don't worry, it will be introduced as a capstone of level 11 library research in CWA: "Build a second airstrip for double the oil of original one". The research itself will also cost oil of course. You didn't think it was going to be easy, slackers?
Or make the second factory like a wonder,that you can swap for a second airstrip (and back again). I mean,a factory should be able to be retooled. I wouldn't pay 600 crowns, but 100 seems reasonable.