By Paul Kurtz

PHILADELPHIA (CBS) - It's been five days now since Malaysian Air Flight 370 and its 239 passengers vanished without a trace, and nobody seems to know where to look.

A local attorney and pilot who specializes in plane crash litigation is critical of the way the search for the missing Malaysian Airlines plane is being conducted.

Arthur Wolk says that, by calculating the flight path, winds aloft and weight of the Boeing 777 it should have been relatively easy to find the wreckage.

"Before you go send 50 ships out there looking for wreckage you need to know where to look and it looks to me like they're looking every which place but where the airplane might be."

In his mind, Wolk believes only two things could have knocked the jetliner out of the sky -- a center fuel tank explosion or a bomb.

"And it would have to be a sizeable bomb because a little one like what might be in a tooothpaste tube or in somebody's underwear is not gonna bring down a triple 7."

He's investigated many plane crashes for victims families but Wolk says this one looks really bad...likely a catastrophic explosion at 35 thousand feet.