By Paige Cornwell Most travelers won’t see all the 100-plus different construction projects transforming Seattle-Tacoma International Airport as they run-run-Rudolph through the terminal. But they will notice scaffolding, long lines and congestion during the holiday rush. Sea-Tac is in the middle of a $5 billion, multiyear series of upgrades totaling 120 construction projects before the July 2026 World Cup, when