https://parcheweb.com/forum/negocio-parcheweb/preguntas-generales/134528-complete~guide~2025-how-do-i-upgrade-to-first-class-on-lufthansahttps://parcheweb.com/forum/negocio-parcheweb/preguntas-generales/134528-complete~guide~2025-how-do-i-upgrade-to-first-class-on-lufthansa