I can concur with the bad luck. Running airships on 8 FC I have definitely gotten a feel for the RNG. My first FC to have a 50 airship had a 3-week lead on my 2nd-8th FC getting a 50 airship. Some RNG later, my first FC ended up being the 3rd one to unlock S01-S22 with all components being equal. Currently I have one FC that has been unsuccessful unlocking S17 or S19 for over a month now and have 3 other FC which are all around 0/10+ on S17 unlock. I swear some airships are piloted by Mr. Magoo.