Didn't read all the replies to this post, my appologies if someone covered this allready..
I live in Missouri and regularly fly down to Florida to spend a week or two with my grandpa.. Every time, i've taken MJ and everytime i've made it through just fine.. You've got a lot of different options, depending on which you prefer.. I've tried 3 different options, and it's worked everytime.. Keep in mind, this is only for flights from inside the United States to another location in the United States.. No experience w/ international flights or customs, hear it's risky 'n not worth the risk..
1) If you're a cigarette smoker... Buy a carton of cigarettes for your plane trip.. Roll up some doobies and fill up an empty cigarette pack... Make sure the pack doesn't bulge and it looks just like a regular, sealed pack of cigarettes, other than it not having the actual seal.. Take out one pack of cigs from the carton and replace it with the pack of doobies.. Depending on how much you're taking, you can put the doobs in a baggie, and wrap the baggie in paper towels.. Stuff them in the cigarette pack, but as I said, make sure the pack isn't bulging to avoid them searching.. With this route, you actually have 2 different options.. I've put the carton of cigarettes in the bag i checked in that didn't go inside the plane with me... and i've put the carton of smokes in my carry-on.. Went through X-Ray and I saw the carton of smokes on the machine, but they didn't check it out..
2) This may sound crazy or not, but it actually worked for me.. When I go down to my grandpa's house, i know i'm going to have some moments of complete bordem and want something to entertain myself.. Everytime i've gone down to his house in Florida, i've taken my Nintendo Wii... I still have the box and all the plastic to wrap up the accessories as if it was never opened.. I've stashed a half ounce in the wii box, put all the other accessories in it, and boxed it up... I actually did this twice when traveling and put it in my carry on case to avoid some luggage boy breaking it.. This could be used with other electronics or maybe even something else w/ the same concept.. With the Nintendo Wii box, the last time I traveled, they took it out of the Carry-on bag and sent it through the X-RAY machine in one of the gray tubs by itself... But it passed through just fine.. Somewhat risky, depending on the people working at that airport.. Just make sure yout don't look suspicious and if they decide to inspect, make sure you act cool and as innocent as possible...
3) The last time I flew down to Florida, for some reason, I got a bad feeling about the previous two ways of getting it on the plane.. I don't really know why, but I had a bad feeling, and decided to come up with another way.. I decided I was going to roll up what I was going to smoke (15 doobs or so), roll them up in a baggie as mentioned in the first example... Then put them in another baggie... An another baggie, but with this one put a decent ammount of pepper in it... Make sure the ganja is in one bag and then inside another bag before putting it in the bag w/ pepper to avoid some sort of contamination... Stick it down in your pants.. For guy, wear boxer briefs.. For gals, not sure what to suggest, but i'm sure ya' can come up w/ something...
I've seen police officers walking w/ dogs inside the airport, and they actually walked right by me when I had the my stuff stashed like option #3 and the dog just kept walking by... I know most the dogs inside the airport, if not all of them are there just to stiff for bombs... But you never know...
It's always a risk traveling w/ marijuana... I normally just fly down w/ the stuff, smoke it, and if there is anything left I pitch it so I don't have to carry the stuff back on the plane on the way back home.. Especially considering most of what is left over is probably roaches and their smell is a lot more potent than the doobs wrapped in a couple baggies and in paper towels..
Anyways, I just got some good high end stuff from a buddy of mine.. Sorry for the rambling, but i got a nice body/mind high going on right now...
This may not be worth anything, put i'm still postin'....