The aviation industry is — and has historically been — one of the safest industries in the entire transport sector. Strict safety regulations and new aircraft technology has made flying safer than ever, but some airports consistently throw pilots for a loop when landing due to various factors, from weather conditions to runway length, and most importantly: topography. Some airports have all three challenges, which can create some especially dangerous conditions. This article will break down four of the world's most challenging airports to land at. Please note that this list is subjective and not exhaustive. 

1. Lukla, Nepal