A flight attendant on the April 20 trip said there was "a loud shaking noise from the belly of the plane." A few minutes later, there was another noise that "sounded like an explosion," the attendant said in an e-mail, according to Dallas television station WFAA.
The incident came to light because the flight attendants who heard the noise and felt the vibration believe their concerns were not taken seriously enough by the pilot, reports CBS News.
And what sort of training does a flight attendant has for this type of expertise? It says in the article the pilot spoke with Maintenance Control. I'm sure the Captain did take her info into account when trying to decide.