The TSA isn't an airline, but its rules trump the individual carriers, so you need to be aware of its rules. Luckily, wine---including Champagne, which is sparkling wine---is allowed on board, as long as it is in your checked luggage.
Alcoholic beverages, including Champagne, are allowed in checked baggage, but you should keep your Champagne in its retail packaging.
United's rules are a bit stricter. Glass bottles have to be enclosed in shape-conforming plastic foam.
Alcoholic beverages with less than 24 percent alcohol, which includes Champagne, are allowed in your luggage with no restrictions.
Delta has no restrictions on Champagne, although it must be in its retail packaging to be allowed.
Many airlines, including U.S. Airways, Air France, Air India and Iceland Air, make no mention of alcohol restrictions on their flights. However, other airlines fly between the U.S. and France. You can get contact information for most airlines worldwide at the Smarter Travel web site at www.smartertravel.com/airfare/directory/.
One thing to keep in mind is the weight limit for checked bags, which varies between 50 and 70 pounds, depending on your airline and your class of service. A couple of heavy green bottles of Champagne could push you over the limit, which can incur a steep fee.
