FMachine-- as I understand it, the rules are in your favor... however, as all frequent flyers know, check-in agents are a "strange species".... some will go out of their way to help you while others throw the book at you, and then you have the ones that dont know what they are doing but still think they are enforcing the rules. I dont dare predict what will happen, but as far as I know, United has been the least "problematic" with wine, at least in the experience Ive had over the last 9-12 months.
Ive heard the odd issue here and there with Delta and Continental, but those are usually resolved when the pax escalates things to a supervisor and is well informed about the TSA policies. Remember to highlight the fact that wine is not a flammable.... etc.