This is one thing I do know a bit about! I’ve brought wine back in checked luggage many times and have never had one break yet. (I’m know I’m cursing myself as I type this) I’ve never had mine marked fragile or tagged priority. My key to success is to roll each bottle inside an article of clothing, I find pants work best, but I’ve used a light weight coat or a sweater as well. I also pack a few extra when ever I take my golf clubs, same idea, wrapped in a golf sweater and tucked inside my golf bag. My record so far, counting what I carried on, is around 14 bottles.

Cheers!
Jimmy.