Can I carry Marijuana on a plane from one Medical Marijuana Legal state to another? I am a Medical Marijuana User.

No. You are protected by the Washington medical marijuana law only while you are within Washington. Although Washington, Massachusetts and many other states have authorized the use and possession of medical marijuana, or otherwise reduced the criminal liabilities for use and possession, the federal government has not. If you take  any amount of marijuana or related implements to an airport or on a plane and are caught by federal security personnel from any federal agency – such as TSA or DEA, for example – you could face federal drug charges ranging from simple possession to possession with intent to sell to drug trafficking. 

You could be even be charged with all of the above. Under federal law, possession of marijuana is punishable by up to one year in jail and a minimum fine of $1,000 for a first conviction. For a second conviction, the penalties increase to a 15-day mandatory minimum sentence with a maximum of two years in prison and a fine of up to $2,500. Subsequent convictions carry a 90-day mandatory minimum sentence and a maximum of up to three years in prison and a fine of up to $5,000.