I had not heard the name mentioned in 2001, so I googled... > Mark Bigham, flight 93 < ..and found a lot of controversey surrounding the idea.. Perhaps an exercise for our conspiracy theorists..
In any case, if he was on the plane and did act in a heroic way..kudos to him.
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Squib;
If you recall, hijackings previously to 2001 were simple hijackings which forced the plane to land in a foreign airfield..thus, completing the hijacker's mission. Sometimes one or two passengers were killed..or empty planes blown up..as was the case in Algeria. Never before had hijackers taken over an airliner to purposely crash the plane. So as far as the passengers knew as the incident started, the plane would land somewhere in Cuba oir elsewhere and most passengers would eventually go home.
As I recall, Todd Beamer and Jeremy Glick did not call out, but were called FROM home..as family members watched events transpire on TV. When they found out that suicide was the mission of the islamic crazies..they decided they were likely doomed, but decided to prevent the murderers from accomplishing their mission..(destruction of the capitol building & as many elected officials as they could).
A rather basic conclusion, when one reviews the information available. and historical perspective of people on the morning of 9/11/01...