Lets start off by saying yes it could have been placed on the plane, I searched my first plane at Washington National airport, it was for Senator Kennedy going home for the weekend, he was thinking of running for President, and was given US Secret Service Protection. If a maintenance worker had placed it back in the aviation compartment, I may have missed it. Tough place to plant a bomb on a commercial airplane, and very hard to find, if you knew to even look for it back there. Perhaps the bomb dog would have found it, or the pilot, or..
from CTI Consulting http://ift.tt/1MLXwAs