Just How Many People Were on UA93?

That is, how many people were in the plane that crashed in Shanksville, PA?

From Jere Longman's "Among the Heroes":

The collective weight of the people aboard the plane was seven thousand five hundred pounds, the coroner said. Only six hundred pounds of remains were recovered...

Okay, granted they may not have found every body part, and some flesh may have been burned beyond recognition, some parts would be dehydrated and lose water weight. But they found less than 10% of the total remains???? That is hard to believe-- particularly when the whole plane is supposed to have basically burrowed into the ground, which would minimize any fire or explosion.

Let's say losing half the remains is reasonable-- that would mean 1200 pounds of people were on the plane. That would be about seven people.

For what it is worth, the crew of UA93 was seven people***, according to Longman.

So how many people were on the plane that crashed in Shanksville, and was it really UA93?

***Interestingly, there were only 37 passengers on UA93. With seven crew members and two pilots, that means there were five flight attendants. Why so many for such a small passenger load? And for god's sake, why weren't five flight attendants able to warn the cockpit that there were hijackers coming???? That makes NO SENSE.