Alcoholic beverages with more than 24% but not more than 70% alcohol are limited in checked bags to 5 liters (1.3 gallons) per passenger and must be in unopened retail packaging. Alcoholic beverages with 24% alcohol or less are not subject to limitations in checked bags. 

Mini bottles of alcohol in carry-on must be able to comfortably fit into a single quart-sized bag.

For more information, see FAA regulation: 49 CFR 175.10(a)(4).