With a staggering 502% jump in passengers, Aeromexico by far enjoyed the largest percentage passenger growth at Sea-Tac International Airport last year.
The Mexican airline, a Delta Air Lines partner, served 93,022 passengers, up from only 15,451 in 2017, mostly because it began nonstop daily flights from Sea-Tac to Mexico City in late 2017. Norwegian Air also boasted a triple-digit increase, up 239.3%, from 28,207 to 95,699. Norwegian launched nonstop service between Seattle and London in 2017.
Among the top 10 airlines based on passenger volume, low-cost carrier Spirit Airlines boasted the biggest jump in traffic on a percentage basis, up 20.3% between 2017 and last year — from 505,624 to 608,228 passengers.
Overall, the airport served 33% more passengers between 2014 and 2018, setting a passenger-volume record of 49.8 million last year.
Alaska and Delta airlines are by far the dominant carriers at Sea-Tac. Alaska last year served 24.1 million passengers, up 5.9%. Delta flew some 11.5 million passengers, up 10.5%.