Laptops.

This is coolbert:

Additionally from the latest edition of the DEBKAfile newsletter:

"Electronic device ban in flight cabins is futile"
   
22 March.

"For Islamic terrorist groups, blowing up a passenger plane and causing hundreds of deaths is their peak achievement. Therefore, it makes sense for American and British security authorities to focus on preventative measures. But the ban on electronic devices larger than a cell phone in flight cabins won't protect the plane from an explosive laptop hidden in checked luggage."

". . . counter-terrorism sources stress that this ban does not guarantee the plane's safety from terrorist sabotage. A fire in the cabin can be quickly extinguished by the flight crew, but one in the belly of the plane, caused by a timer-activated bomb hidden inside a laptop computer, for example, would more likely cause the plane to crash."

AIRCRAFT OF THE ISRAELI NATIONAL CARRIER EL AL HAVE ARMORED BAGGAGE COMPARTMENTS!! EVEN IF A BOMB GOES OFF IN CHECKED LUGGAGE THE ARMOR WILL CONTAIN THE BLAST, AND HOPEFULLY NO FURTHER DAMAGE TO THE AIRPLANE WILL OCCUR!!

coolbert.