It's possible to find out whether a 787 was made in Everett or Charleston by checking the production site and remarks on planespotters.net e.g. https://www.pla

It's possible to find out whether a 787 was made in Everett or Charleston by checking the production site and remarks on planespotters.net e.g. https://www.planespotters.net/airframe/Boeing/787/G-ZBJM-British-Airways/a1WNU159 https://www.planespotters.net/airframe/Boeing/787/G-ZBJM-Bri... vs. https://www.planespotters.net/airframe/Boeing/787/9V-SCF-Singapore-Airlines/Je8Qc15d https://www.planespotters.net/airframe/Boeing/787/9V-SCF-Sin...