The father of the co-pilot who died along with eight others when her Learjet crashed in Florida feels immense pride when he listens to his daughter's heartbreaking final radio transmissions to try to figure out why it plunged from the sky. Twenty-year-old Nathalia Filgueiras started out by calmly reporting that some ice was building up on the plane on Sunday as they flew into a thunderstorm and turbulence tossed the Learjet up.