killed in the collision. the apa said terry barker and len root were among the crew members on the b-17 flying for fortress. our hearts go out to their families, friends and colleagues, past and present, their tweet said. the ntsb is launching a go team to investigate saturday s midair collision. a tweet from the ntsb on saturday evening said in part. no spectators or others on the ground were reported injured. the debris field from the collision includes the dallas executive airport grounds, highway 67 and a nearby strip mall. it is worth noting that the faa does require these stunts to be approved ahead of time. one expert tells us, though, even as safety measures have been put in place over the years there s still tremendous risk when performing complex and dangerous moves. here s mary scavo. when tragedies happen at air shows the faa has to reevaluate whether this should be allowed. remember, even though the regular federal aviation rules