Hello, Chicago Wine Lovers!
This was first a question of mine when I used to fly PanAm from Europe to the U.S.
The response I always got was pretty much "Don't ask, don't tell".
I think it is officially frowned upon (there are probably FAA/airline regulations).
If it's domestic U.S., you can probably wait. Or befriend a FA.
If it's international, they serve wine in Y (screwtop), so if you bring your own:
1) You need to get your corkscrew past security
2) Open your nice bottle of wine with discretion and enjoy