"Seven tons of secret explosive equivalent to eleven tons of TNT."
Well, I'll bet that 11 tons of TNT is a lot less complex and more cost effective than 7 tons of "secret explosive". Either that, or someone made a typo
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They might not be able to fit an 11 ton bomb on the aircraft, or it may not have the lifting capacity.
I agree that 11 tons of TNT would be a lot cheaper, but telling the world that you have a "secret explosive" also tends to furrow the brows of defense analysts as well as guarantee better hookers for your diplomats overseas.