As of now, 20 states have legalized marijuana for medical purposes, and voters in Colorado and Washington have approved marijuana for recreational use. About a dozen more states are expected to legalize marijuana in some form over the next several years.
As of January 31, 2014, passengers traveling internationally into the U.S. and connecting to another flight are allowed to have in their carry-on baggage liquids in excess of 3.4 ounces (100 mL) that were purchased as duty-free merchandise.
Carry-on Bag Limitations. Carry-on bags must be small enough to fit easily into an overhead bin or beneath the seat, because luggage isn't allowed on laps or in the aisles. Most airlines allow bags up to 45 linear inches in size, or measuring 9-by-14-by-22 inches.