Because they found that the gas tank was installed, it's no different from the small blast. Best large unfounded even without gas tank, it is considered dangerous to the aircraft is as well.
Because there's a small gas tank installation. It's no different from floating bombs. The big buzz, even without the gas tank was considered a danger to aircraft is the same.
Due to the installation of small gas tank. It is different from the bomb could float. The large balloon without gas tank, it is considered dangerous to the plane is the same!