Article Photos: Avoiding plane crashes as air traffic doubles 1/5

FILE - In this July 17, 2014, file photo, people walk amongst the debris, at the crash site of a passenger plane near the village of Hrabove, Ukraine. More travelers are flying than ever before, creating a daunting challenge for airlines: continue to keep passengers safe in an ever more crowded airspace.  (AP Photo/Dmitry Lovetsky, File)