If you want to travel with quantities of whiskey greater than what you can carry in 3-ounce bottles, you will need to pack it in your checked luggage. Even if you do, though, you can't travel with just anything. The TSA prohibits any type of air travel with whiskey — or other liquors — more than 140 proof.
Checked Bags: Yes 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.