"...does it not appear odd that ONLY people who didn't hear the word "bomb" are the ones being interviewed?"
That is because veryoen they have intervewed has say the never heard the word "bomm".
"Does anyone recall hearing the word bomb?"
Nope.
Nobody has made that claim except the feds, and for the record they have changed their story once so far.
There have been a number of differnces between "official accounts," including an early account that had the guy arriving from Columbia and acting up at the normal deplaning time of that flight.
Some of the official reports have the guy YELLING a bomb threat, but all of the official reports have him uttering a bomb threat.
What specific "change" in story did you have in mind?