http://www.bbc.com/news/world-asia-26503469

There were only three.

This BBC page has information on many of the passengers, and states that there were 3 Americans on board. http://www.bbc.com/news/world-asia-26503469

dang it, JP beat me by milliseconds!

Philip Wood, 51, was identified as the only adult passenger traveling on a U.S. passport on Flight MH307. Two other American travelers have been named as toddlers Leo Meng, 2, and Nicole Meng, 4.

http://www.bbc.com/news/world-asia-26503469

There, now @hearkat won’t feel so bad

There were three Americans. One of them:

American Philip Wood, an IBM employee, was also on the Malaysia Airlines flight
IBM executive Philip Wood, 50, originally from Texas, was one of three Americans on the plane.

Mr Wood – an avid traveller – had just been transferred to Malaysia and was excited about the new beginning, his younger brother James told the Wall Street Journal. It was his last planned trip to Beijing before settling in Kuala Lumpur. He has two sons from a previous marriage who are based in Texas, reports say.

“We are all sticking together,” his father, Aubrey Wood, told the New York Times. “What can you do? What can you say?”
The other Americans aboard were children: Nicole Meng, 4, and Yan Zhang, 2.

filmfann.. Always the gentleman.

Wow I never saw that. Thank you muchly.