No Coop No Problem
Songster
Flight ability is most definitely entirely genetic. However the tendency for flight is nurture to some extentAfter keeping a bunch of different breeds, I've seen noticeably improved flight ability in a few individuals.
So I vote for nature rather than nurture.
One black Ameraucana roo shocked me with his ability for vertical takeoffs. He was always a little gymnast as soon as his wings started catching air as a chick, and he never lost it.
One day when he was a year old, I was being lazy (tired) about collecting eggs and their breeder pen just had a plastic crate for eggs on the ground. So when I opened the door I just kinda bent in and dragged the crate to me at the door.
I hear what almost seems to be the absence of noise, but in hindsight must have been a light whooshing. I look up, and there's a big black shape hovering above my head. In one spot, about 6ft high. I jumped back a bit in surprise, and after a few stunning seconds of staring at this hovercraft... he gently beats back down to earth, still in the same spot.
I realized from his demeanor that I scared him to flight with my abrupt redecorating, rather than him being aggressive.
It actually makes sense because some breeders of black Ameraucanas used Sumatra far back in their lineage to improve some traits.
And Sumatra are known to be the best fliers in the chicken world, even crossing ocean to reach a different island.
I've also seen good flying ability from Mosaics, just the hens who are pretty light. I crossed one of those with the Am roo mentioned above and got Licorice.
Everyday Licorice lets herself out of our chicken yard more than a dozen times. She hops right back over in a few minutes after finding herself some goodies. We've let her keep her wandering ways because she doesn't get stranded on the wrong side of the fence like all the others. Unlike other chickens who try to escape, she doesn't need much launching room but will just go up an over effortlessly.
On the flip side, I've had English Orpingtons who couldn't get 4 ft off the ground to roost. That's with them really wanting and trying to get up there to be with the others. I had to make sure they had lower roosting locations before they would stop plunking themselves down on the ground to sleep.
Out of a lot of other breeds, including:
Genetic Hackles, other colors of Ameraucana, Speckled Sussex, Faverolles, Silkies, Polish, Wyandottes, none of them could fly very well. Leghorns, of course, flew very high when they wanted but they did seem to need some takeoff room to get started.
In conclusion, I think the ability to fly well is just rare. As humans for hundreds of years have not preferred their poultry to escape.
"Flightiness" is still very much listed in the Cons list of some breeds. At first, I thought it must refer to the personality, aka skittishness. But I've heard serious breeders firmly say it's the birds propensity to get out of an enclosure. So... either they are mistaken or I am.