The AN-32 crash in Arunachal Pradesh has become another grim reminder of the reality that flying over the mountainous state continues to be fraught with risks. 

For World War II pilots, this eastern Himalayan region was the “Skyway to Hell” and despite advances in flight technology since then, the stretch of deep valleys and high mountains is still one the deadliest flight routes in the world. 

And once a plane goes down, the dense foliage and cloudy hills make it hard to even fi ..