There are larger galliformes that fly well. The wild turkey being one we’re probably all familiar with. They have large wings.How much of a chicken's flight ability is based on wing length/mass/muscle, and how much on experience? My birds fly at most two feet off the ground, regardless of breed, and seldom try to get up into trees. Not even as chicks. Their "flight" down is more of a controlled plummet.
Their muscles should be able to support flight, and at least as chicks they're not too heavy. As adults, technically their bone mass and muscle structure should support limited flight.
Do they not do it because they've never seen it done?
I notice some if my large oriental gamefowl crosses that inherited larger wings relative to body size from the bankivoid side still prefer to run. They’ll try to copy the bankivoids when the bankivoids fly to me but they look like albatrosses trying to take off.
As where they have difficulty even when their wings are larger, I think its part instinctual and part their weight in their legs. I bet if one had the will to constantly do it, they’d build up the strength to fly greater distances. Yet they lack the will