The issue of whether you can travel on airplanes with marijuana is complicated by the fact that TSA agents are federal government agents, and marijuana is still illegal on the federal level. Crossing state lines with marijuana is still a crime, even if you start off in Oregon. Theoretically speaking, if you fly in-state, you should be able to carry your recreational marijuana on the airplane, but do not be surprised if you are questioned by a TSA agent if they find it in your luggage.