Calmest routes (score > 85)
SIN–NRT (Singapore Airlines, 89) · SYD–AKL (Air NZ, 87) · HND–SEA (ANA, 86). Pacific transoceanic benefits from smooth jet-stream patterns and strong carrier operational discipline.
Most turbulent
Any transatlantic route in Feb–Mar. BOG–MDE over the Andes year-round. GVA–CDG in winter crosswinds.
Airline standout
Korean Air posts a 15-point higher service score than the US legacy average, which meaningfully moves the number on any route they fly.