This is something I made a while but I never got around to posting it. It is a plane I modeled after an older Boeing Strato-Jet Bomber.  Almost EVERY switch is fully functional in it except for 2, and it actually DOES drop live tnt . It took a bit of red-stone engineering, but I got it to work ! I discovered through trail and error while trying to make tnt fall from a plane. That if you leave an open hole in the bottom of the plane place tnt in it with nothing under it but the ground below. Then you place red-stone on the block next to the ones with tnt, and activate it with a switch, the tnt will activate and fall, hit the ground and explode ! It can drop up to 6 tnt at a time, and if you leave the red-stone activated it can drop as many tnt as you can place. Hint - do not drop the tnt if you place the plane on the ground, use mcedit and place it about 30-50 blocks above the ground level otherwise it will blow up the plane.Remember to add diamond if you like, and feel free to give me feedback. Check out the pics to see how to set it up to drop tnt bombs !

Note:  It does have the schematic, you may use is for whichever you like, but remember if you share it, give me credit since I built it.