WJLA ABC World News With Diane Sawyer April 13, 2011
good evening. believe it or not, it's happened again. early this morning, another air traffic controller asleep at the switch while a flying ambulance with a sick passenger on board circled overhead, desperately seeking clearance to land. it never came. the pilot took that risk and landed anyway. and while everyone on board is okay tonight, the rest of us is wondering what is going on in those control towers? the transportation secretary is standing by to answer those questions but we start with our aviation correspondent lisa stark on the story again tonight. lisa? >> reporter: good...
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