How many b 17 are still flying?

Most specifically -- answer of 14:

"Today, fewer than 100 B-17 airframes exist and fewer still are in airworthy condition. At one time, more than 1,000 B-17s could be assembled for mass combat missions, less than 15 of Boeing's famous bombers can still take to the air."

BTW - The EAA AirVenture Musuem's WWII B-17 Flying Fortress does a tour of the USA every year, giving morning rides and ground tours (usually in the afternoon). While it's not cheap, it's a truly unique experience and one which will last a lifetime. More info on the home page: B-17 near Boston August 20-22, 2010 - at the Lawrence Municipal Airport -- Come out for a ground tour. If booking a flight, book before Aug 19 for a $26 discount.